Boy, oh boy, working at TV Tropes has been really getting me into a rut. I feel like I deserve a good break after all of this. Now I know how a troper feels.

Wait a minute! I just created a new trope! This is basically a Stock Phrase that a character uses to describe the mood that he's in.

Examples

Anime and Manga

Lupin III episode "Lupin Becomes a Bride"
.Lupin III: Now I know how Jack Lemmon felt...

Film

Die Hard - Now I know what a TV dinner feels like .
My Little Pony: The Movie
Danny: Now I know how an ant feels.
Meet the People (1944)
Julie Hampton: [after kissing hundreds of shipyard workers] Now I know how a trumpeter feels!
Teenage Mutant Ninja Turtles II: The Secret of the Ooze''. Michaelangelo has been spun in circles, been thrown through the air and hit a wall.
Michaelangelo: Now I know what a postal package feels like.
How to Kill Your Neighbor's Dog
Peter McGowan: [after a prostate exam] Now I know what a Muppet feels like.
Patterns (1956)
Nancy Staples: [dropping Fred off at work] Now I know what a mother feels when her child goes to school for the first time.
Citizen Cohn
Roy Cohn: [after being paid a compliment by an opponent] Now I know what a pancake feels like after it's had syrup poured all over it.

Literature

The classic children's book Bread and Jam for Frances after she goes through the Radish Cure.
Jam for breakfast
Jam for meals
Now I know how a jam jar feels
Full. Of. Jam.
The Hobbit. Bilbo, after being rescued from the top of a burning tree by an eagle, says that he now knows what a piece of bacon feels like when it is taken out of the pan and put back on the shelf.

Live-Action TV

NCIS: Los Angeles episode "Anonymous"
Henrietta 'Hetty' Lange: March!
Marty Deeks: Now I know how Cinderella felt with her evil stepmother.
Married... with Children Unknown episode
Peggy: Al, how am I supposed to do my job and yours? I tell ya, now I know how Hillary [Clinton] feels.
- "Valentine's Day Massacre"
  Bud: [after being raped by a very large older woman] Now I know how Tom Arnold feels.
The Fresh Prince of Bel-Air episode "Sleepless in Bel-Air". Philip is bothered by a noisy cricket.
Philip Banks: Now I know how Captain Ahab felt when he was chasing Moby-Dick.
Star Trek: Voyager episode "Parallax". The Doctor is activated to provide hydroponics supplies.
The Doctor: Now I know how Hippocrates felt when the king needed him to trim a hangnail.
Knight Rider episode "The Wrong Crowd"
Bonnie Barstow: Now I know how Michael felt when K.I.T.T. was destroyed. Like half of me is missing.
The Bionic Woman episode "The Jailing of Jaime"
Jaime Sommers: Boy, now I know how Bambi felt on the first day of deer season.
Half and Half
Big Dee Dee Thorne: Well, since no one has offered to buy me a drink, I guess I'll buy my own. Now I know how Phyllis feels.
The Adventures of Young Indiana Jones episode "Daredevils of the Desert"
Indiana Jones: [about the rugby match] Too bad I got pounded by British artillery. Now I know how the Turks feel.
The New 3 Stooges. Moe hits Curly Joe in the nose with a broom.
Curly-Joe: Now I know how Pinocchio felt.
The Office episode "Cafe Disco"
Michael Scott: Now I know what the founders of Philip Morris felt like. You just want to give people a smooth, fun way to relax and suddenly you're just some terrible monster.
Doctor Who episode "Planet of the Spiders: Part Five"
The Doctor: [being held in a giant cobweb] Now I know what a fly feels like.
Jackass:
Johnny Knoxville: [being doused with red wine] Now I know what it feels like to be my liver!
Electra Woman And Dyna Girl episode "Glitter Rock: Part 1"
Glitter Rock: Those walls are gonna keep moving in, and hit with a big bang!
Dyna Girl: Now I know what a sardine feels like!

Puppet Shows

The Puzzle Place episode "Cute Is as Cute Does"
Jody Silver: [after being caught by the vine] Now I know what a tossed salad feels like.

Video Games

Monster House
Chowder: Now I know how taco meat feels.
The Dig: After the first time he uses the planet's tram system, Commander Lowe comments, "Now I know what my pet hamster felt like."

Webcomics

In Gunnerkrigg Court, Annie, falling into a canyon, remembers dropping and breaking a glass, and thinks:
"Now I know how the glass felt."

Western Animation

From the Super Mario World episode "Mama Luigi":
Mario: Now I know how a meatball feels!
A Macy's Thanksgiving Day Parade announcer does this on The Simpsons, to the perplexity of his colleagues.
Bill: Ha ha. Wait, what did... Did what I say make sense?
Marty: Well, no, not really, Bill.
Bill: Boy, now I know how the Pilgrims felt.
Marty: What are you talking about, Bill?
- The episode "Mypods and Boomsticks":
  Bart Simpson: Stupid angry mob chasing me for shining a harsh light on modern society. Now I know how Dane Cook feels.
- During the episode "Missionary Impossible", after Homer introduces gambling to the natives:
  Homer: Now I know how Bob Stupak feels.
Family Guy, "Emission Impossible" - Peter and Lois are trying for another baby, and Stewie doesn't fancy the competition:
Stewie Griffin: My God, they're at it again! All this time keeping people from having sex...now I know how the [Roman] Catholic Church feels. BA-ZING!
- "Wasted Talent"
  Peter Griffin: Oh man, this is the happiest day of my life. Now I know how Barbra Streisand must've felt the day she married James Brolin.
King of the Hill:
Bobby Hill: Everybody's got a deer and I don't. Everything looks so Christmasy. Now I know how the Jewish kids feel.
Teen Titans:
Beast Boy: Now I know how George Washington felt when Napoleon beat him at Pearl Harbor.
Captain Planet and the Planeteers episode "A World Below Us":
Kwame: [While imprisoned in a net] Now I know how fish feel!
G.I. Joe: The Cobra troops are surrounded.
Major Bludd: Now I know how Custer felt!
Totally Spies!: The girls are tangled in seaweed.
Clover: Now I know what sushi feels like.
The Perils of Penelope Pitstop episode "Hair-Raising Harness Race", after the Ant Hill Mob land in fresh concrete:
Clyde: Now I know what a statue feels like.
The Magic School Bus episode "Revving Up", while in the bus' carburetor:
Wanda: Now I know how a tossed salad feels.