Unlike a regular television crossover
, the Crossover Punchline is a last-minute gag at the end of an episode. The Crossover is not vital to the storyline, it's just there for the fun of it. Used for laughs, it generally also uses the tropes All Just a Dream
or Alternate Universe
- Project A-Ko featured a blink-and-you'll-miss-it gag at the end of the original OAV, where A-Ko's mother is seen sewing something that looked suspiciously like Superman's costume. The gag (that A-Ko is Superman and Wonder Woman's daughter) is made far more explicit in the Antarctic Press adaptation, where her parents refer to each other as "Clark" and "Diana."
- At one point in The Big O, Roger Smith (who's a noted Batman Expy) is approached by a pair of reporters that look exactly like Lois Lane and Jimmy Olsen.
- Despite already being a crossover, Double Rainboom has one of these: At the end of the video, where Rainbow Dash is writing her letter to Princess Celestia about why you should not take things that don't belong to you, Pinkie Pie asks "What will I do with this then?", pulling out Bloo from hammerspace. The Foster's theme tune then plays as the video fades to the ending credits.
- This Ed, Edd n Eddy fancomic features a surprise appearance of Denzel Crocker in the last panel, giving an F like he always does.
- At the very end of the 1944 Bob Hope film The Princess and the Pirate Bob thinks he's won the girl, only for her to rush past him and into the arms of his Road Picture co-star Bing Crosby, who had not been in the picture heretofore.
- At the end of My Favorite Brunette, Bob Hope's character is given a last-minute reprieve from execution; Crosby plays the very disappointed prison guard who was going to throw the switch on the electric chair.
- Wayne's World. "Have you seen this boy?"
- The epilogue of the series finale of Newhart had Bob Newhart waking up in bed on the set of The Bob Newhart Show, next to his wife of the latter series, Suzanne Pleshette, explaining about his nightmare of being an innkeeper.
- The final show of Noel's House Party ended with Noel waking up on the set of his earlier show Swap Shop.
- An episode of Caroline In The City ends with Niles and Daphne of Frasier arguing over whether or not the most recent strip is funny.
- The Seinfeld episode "The Keys" ends with Kramer appearing on Murphy Brown.
- After the credits of one episode of Mr. Show, a comic is seen talking to Dr. Katz. Especially weird just because Mr Show is live-action.
- One Halloween episode of Boy Meets World had a witch who wanted to sacrifice the guys in an occult ritual. At the end of the episode, they discuss the incident with another girl: Sabrina the Teenage Witch.
- A Halloween episode of Two Guys, a Girl and a Pizza Place revealed the killer that had been going around offing the cast to be... Mimi from The Drew Carey Show, who said she wanted her own time slot.
- An episode of The Lucy Show had Lucy mistakenly drafted into the marines, driving her drill sergeant insane. When she finally is able to leave, the sergeant is relieved he'll never have to deal with someone as nutty as her ever again. Enter her replacement...Gomer Pyle.
- In an episode of the Family Matters, Richie has a friend over that says Carl "does look like the Dad from Fresh Prince!" During the credits, an outtake of this scene was shown. When Richie's friend says line this time, James Avery enters to everyone's amusement.
- In the final episode of Coach, Hayden and Christine find that Larry, Darryl, and Darryl from Newhart have been watching their cabin after they left for Orlando (not actually living inside the cabin, just watching it while they slept under it). This also doubles as an in-joke, because both shows were created by the same person (Barry Kemp).
- In an episode of Chuck, Big Mike turns out to be a cousin of Sgt. Al Powell.
- The October 31, 2010 strip for B.C. has The Fat Broad running a pumpkin pie stand. The Cute Chick asks her where she found enough pumpkins to make the pies. The Fat Broad says that she just found one really big pumpkin. Cut to Linus, Sally, and Charlie Brown in a pumpkin patch with Charlie Brown saying "I don't think he's coming, dude."
- One of Garfield's "I hate Mondays" gags was prompted by seeing Snoopy's reflection in the mirror.
- References to Family Circus characters are a Running Gag in Pearls Before Swine.
- 1997 was the year of the Great April Fools' Day Comics Switcheroonie, in which a number of comic strip writers and artists handled each other's strips as a massive practical joke. In several cases characters from different strips met, such as Garfield and Jon having their house painted and leaving to visit the Bumsteads.