Shrek's line "Do you think maybe he's compensating for something?", upon seeing Lord Faarquad's towering castle, could both be interpreted as Faarquad compensating for his height or... something else. (Especially since at the time, Shrek doesn't actually know Lord Farquaad is short.)
In the proud and dirty tradition of British comedy, Wallace & Gromit has some well-hidden but very deliberate double entendres.
In The Curse of the Were-Rabbit, the object of Wallace's affections steps behind two very large marrows and sighs as she bemoans, "Victor just doesn't appreciate my produce." In another scene, Wallace finds himself suddenly naked, and quickly dons a cardboard box which reads "May Contain Nuts."
Christopher Walken uses his trademarked delivery to create one of these in Antz: "She's about yay tall, fairly easy... on the eyes", describing the missing princess.
Doubling as a Parental Bonus, in Ratatouille, Linguini talks to Colette about his "Little Chef". While kids see it as Linguini trying to tell her about Remy (who Linguini calls Little Chef), adults can see a different meaning in his words... When Linguini says "I have a small..." Colette looks down for a split second.
Even Disney did this (albeit unintentionally) in The Hunchback of Notre Dame, when Laverne incorrectly overheard Quasimodo and Esmeralda on top of the bell tower. "Frollo's nose is long, and he wears a truss." According to the directors' commentary, even though this wasn't the effect they were going for, kids often misheard "truss" as "dress." So the adults laughed at the idea of Frollo wearing a truss, and the kids (and some of the adults) laughed at the idea of Frollo wearing a dress.
[while Esmeralda is dancing] "Look at that disgusting display!" (with an eager smile on his face) "Yes sir!"
"I was just thinking about putting a rope around that pretty neck of yours"
Though never said in-movie, creators have said that Toy Story's main protagonist's real name since the beginning has been 'Woody Pride'.
It's most likely unintentional, but really? The main characters' names are Woody and Buzz? The Sex Toy Story parody writes itself.
There is also the line by Rex at the end of the first movie about how he would like for Andy to get a herbivore so he could play the "dominant predator".
Chomper: Friends for dinner, I'm gonna have friends for dinner...
To clarify stuff, Chomper's a Sharptooth while his friends are various herbivores that his species would see as food. He's actually gathering leaves and berries for them, but thedouble meaning can be inferred.
In Get Smart, The Chief mentions that they need to employ a new agent, unknown of KAOS who's acquired a list of all CONTROL agents and is eliminating them.
Larabee: Let me out there, sir, I have no problem exposing myself. Agent 99: Do you ever think before you speak? Larabee: No, I just whip it out there. Seems to work best.
Groucho Marx: Animal Crackers gives him the line "We took some pictures of the native girls, but they weren't developed." and has him present Margaret Dumont with a large wooden box. While describing it as "a magnificent chest", he accidentally points at her torso.
Groucho: I present you with (points to his own chest) this magnificent chest - uh, (points at her chest) this magnific- uh, (points at the actual box) THIS magnificent chest.
Both lines are topped by when Groucho introduced a musical performance by Chico: "Signor Ravelli's first selection will be "Somewhere My Love Lies Sleeping" with a male chorus.'
Lampshaded in the film version of Harry Potter and the Goblet of Fire: when talking to Harry, Hermione says Viktor Krum doesn't talk much, as he's "more of a physical being". There is a pause, and she laughs, saying that she didn't mean it that way.
"So, did you and Ginny do it?" note Hide the Half-Blood Prince's book, that is.
The female cop in Hot Fuzz speaks almost entirely in these, quite intentionally.
The 1935 version of Les Miserabes features a scene where Valjean carries unconscious Marius through the Paris sewers and all they entail. When at last they make it to safety, Marius thanks his hero by voicing one of the funniest unintentional lines in film history: "I know what you went through to bring me here."
Bond should probably have a special page just to list a choice sampling of this trope. Here's a real gem from You Only Live Twice:
Tiger Tanaka: I have much curiosity, Bond-san. What is "Little Nellie"? James Bond: Oh, she's a wonderful girl. Very small, quite fast, can do anything. Just your type.note He's referring to a small gyrocopter being assembled from a five-case kit during these lines.
This movie in fact begins with Bond getting machine-gunned in a girl's bed. The Hong Kong police remark "At least he died on the job...he would've wanted it that way."
Moonraker. Q: "I think he's attempting re-entry, sir!"
The song "Keep it Gay" from the musical remake of The Producers. Sung by the flamboyant director Roger De Bris and his equally flamboyant partner, who never explicitly mention homosexuality in the lyrics.
The song "Let's Duet" from Walk Hard: The Dewey Cox Story turns several innocuous lines into double entendres by virtue of well-(or poorly-)timed pauses. Such as: "In my dreams, you're blowing me... some kisses." and "I just want to beat off... all my demons."
Played for laughs when Dewey sings a sweet song about holding hands at his high school dance. It's an utterly banal, benign song, but it inspires all the kids to dance provocatively; the girls even rip their shirts open. The outraged preacher later insists that everyone knows what "hold your hand" really means; a befuddled Dewey insists it means exactly that.
While he's discussing the size of said tracts, he's making a lifting and grabbing motion with his hands, which are situated in front of his chest...
Kate and Leopold: the man announcing the Brooklyn bridge; "And in the future I believe men will be judged by the size of their erections!"
The hook on which all the jokes in the Carry On! movies hang.
As parodied in thisThat Mitchell And Webb Look sketch, in which a doctor working at a typical 'bawdy 1970s hospital' has a bit of trouble grasping the nature of Double Entendre, with unfortunate results ("Shall I rub them against my cock?").
"Gee, I musta hit her pretty close to the mark to get her riled up like that, huh kid?" (And her reply: "Well I guess you don't know everything about women yet.")
"It's a small thermal exhaust port right below the main port."
Down Periscope has a series when introducing the lone female character:
Lt. Cmdr Dodge: Men, at ease. I'd like to introduce you to the newest member of our crew, Lt. Emily Lake. Emily is part of a pilot program to test the feasibility of women serving on submarines. She's going to be our diving officer. Stepanek: Can she do a one-and-a-half inward back in the layout position? Lt. Cmdr Dodge: All right, look, gentlemen! I know this is an unusual situation. Can't be easy for Lt. Lake here to be thrown into a jungle such as this, and I know it will make things hard on all of us... Let me re-phrase that. It's going to make things difficult on all of us as well. But if we just work together as a team, I'm sure we can handle ourselves... Comport ourselves as professionals. That is all.
The full designation of EDI, the AI controlling the UCAV in the film Stealth, stands for Extreme Deep Invader.
Henry Purcell:Yeah, I've been called that a few times. (Group Laughs)
Hairspray has a very neat little Triple Entendre. Corny Collins, amid a mist of hairspray, declares to one of the female dancers, "Looks like you need a stiff one!"
Brush up on your classics, people: The classic noirTo Have and Have Not has Lauren Bacall intone to Humphrey Bogart, "You know how to whistle, don't you, Steve? You just put your lips together and... blow."
The film noir parody/homage Dead Men Dont Wear Plaid one-ups this somewhat, when Rachel Ward tells Steve Martin, "You know how to dial, don't you? You just put your finger in the hole and make tiny little circles."
For all the kids in the audience: this joke references an old device known as a "rotary phone", which became obsolete somewhere in the 1980s. And now you know.
Double entendre? Even ignoring the preceding dialog, with Bacall's delivery that line doesn't even qualify as a single entendre. It's, like, 3/4 of an entendre, tops.
In Event Horizon, after everyone wakes up from cryo sleep, there's a hilarious exchange between Cooper (who's black) and Lt. Stark.
Cooper: How 'bout you, Stark? You want something hot and black inside you? Stark:(She gives him the finger.) Cooper: Ooh, is that an offer? Stark:(wryly) It is not. Cooper: All right, well, how about some coffee then? (He gives her the coffee.)
Francie:(sharing a chicken meal) Do you want a leg or a breast? John: You make the choice. (...) Francie:(before watching the fireworks) I have a feeling that tonight, you're going to see one of the Riviera's most fascinating sights... I was talking about the fireworks. John: I never doubted it.
In Hard to Kill, the nurse asks a comatose Steven Segal if he wanted some pussy, then shows him a kitten.
In Josie and the Pussycats, Melody causes a car crash when she holds up a promotional sign that read "Honk if you love pussycats". The "cats" part was concealed by a bush.
In The Ladies Man, Leon Phelps can't resist making innuendo when a nun he was interviewing starts talking about her "missionary position" in Africa.
When Scorpio meets Dirty Harry for the first time, he comments on how big Harry's gun was.
In Double Indemnity, Walter and Phyllis start exchanging these the moment Phyllis appears at the top of the staircase wearing nothing but a towel.
Neff: The insurance ran out on the fifteenth. I'd hate to think of your getting a smashed fender or something while you're not — uh — fully covered.
Mr. Smith: I don't exactly keep count, but I would say... high fifties, low sixties. I've been around the block, but you know the important thing is— Mrs. Smith: Three hundred and twelve. Mr. Smith:Three hundred and twelve? How? Mrs. Smith: Some were two at a time.
Naturally, they were discussing how many people they'd killed.
The Bard uses a string of these in Shakespeare in Love when describing his writer's block, claiming at one point that that "the proud tower of my genius has collapsed" and that coming up with ideas is like "trying to pick a lock with a wet herring." And yet he's surprised when his psychiatrist asks if he's been "humbled in the act of love"...
Iron Man 2, anyone? (Admittedly, Robert Downey Jr. makes Tony Stark such a masterful Deadpan Snarker that some are easy to miss.)
Justin Hammer: You know Christine Everheart from Vanity Fair? You two know each other? Tony Stark: Yes, roughly.
It gets better.
Hammer: She's actually doing a big spread on me for Vanity Fair. Pepper Potts: Right. Well, she did quite a... spread on Tony last year... Tony: AND she wrote a story.
But wait there's more! After discussing getting Hammer a slot on the schedule to present at the Stark Expo, Tony is called away by Natalie, and drops this little nugget:
Tony: Hammer needs a slot, Christine.
"Who's the black private dick that's a sex machine to all the chicks? Shaft!"
The "poetry reading" scene in the elephant in Moulin Rouge!. On top of all the verbal ones, there's the moment where Satine has passed out and Christian is trying to revive her. His position and motions look very bad (or good) to the voyeuristic Zidler...
"He's got a huge... talent!" Satine: Why don't you lie down over here? Christian: I prefer to do it standing." (cue a very flabbergasted look from Satine) "You see, it can be quite long...
Dark Helmet: I see your Schwartz is as big as mine! Now let's see how well you handle it. note Lightsabers projected from their rings. It certainly doesn't help exactly how both of them position themselves to produce them, nor how, between those two sentences, each takes a quick look down.
Colonel Sandurz: It's Mega Maid! She's gone from suck to blow! note Her vacuum cleaner stealing the air from Druidia is now returning the air.
Nuns On The Run has a few, since the plot is British gangsters forced to hide as nuns.
Most of the Olsen Twins movies are peppered with really creepy double entendres, as can be found here.
Alex: I'm so sorry Daddy, that I didn't tell you. I didn't think you'd approve and I didn't wanna disappoint you. I know how you wanted me to be a neurosurgeon. But I've discovered a whole new way to help people... that makes me feel so... alive.
Mr. Munday: Whatever makes you happy. Alex: I am so relieved! It's been killing me, you not knowing all these years. I- Daddy... Natalie, Dylan and I are a team. And we just took on 12 sailors. You can't even imagine the positions we get ourselves into. Daddy, I wish you could watch us work. You'd be so proud. I'm gonna take a shower because I am covered in- Well, you can only imagine what. And then when I get back, I am gonna give you... a full blow-by-blow.
Connie Swail:(who has just been rescued from becoming a virgin sacrifice) How come his is so much bigger than yours? Officer Joe Friday: Miss? Connie Swail: The gun. Officer Joe Friday: I've never needed more.
Dick has more than one off-color use of Richard Nixon's nickname.
Mystery Team Charlie is completely incapable of understanding them
In the Rock Hudson/Doris Day movie Lover Come Back, Day's ad exec character gets the idea to come up with new packaging for Miller floor wax. She says' "The agency that gets this account is the agency that can show Mr. Miller a new can." Cut to a line of Bunny ClubBunnies, seen from behind
Blazing Saddles. Early in the movie Bart (played by the African-American actor Cleavon Little) is almost hanged. Later on a friend greets him with the line "They said you was hung!" and Bart says "And they was right!" (i.e. "well hung", well endowed).