Nothing says “I love you” quite like the greeting: “Truly, yours is a butt that won’t quit.”
Everyone knows that The Simpsons featured the greatest Valentine's Day card in the entire history of mankind.
It's the pity card that Lisa Simpson gives to Ralph Wiggum on Valentine's Day in the episode "I Love Lisa" from the show's fourth season (that was 1993, by the way. Yep, 22 years ago).
"It says "choo-choo-choose" me, and there's a picture of a train!"
20th Century Fox
She made them for the purpose of fans printing them out and sharing them.
There's that great declaration (and lame Burns' heir audition) from Milhouse.
Woodrow/Homer couldn't have said it better...