Here are just a few of the responses from people around the world:
RabidPancakes: Found out my girlfriend of almost 5 years was cheating on me today (the day before vday), so probably that?
JAJAY797: Herpes, in a five-year marriage, where neither party had it before.
penelope_pig: A positive pregnancy test.
Pondgirl77: Last year I got a gas station Muffin, that had a bite taken out of it.
makingmc: My dad gave my step mom a toilet seat once for Valentine's Day. He genuinely thought he had the best gift ever.
Superdude100000: 200+ pieces of undercooked bacon, made to look like hearts. The greasiest gift I've ever been given. And we ate every single piece between the two of us...
BosqueBravo: A scrapbook containing "all your happiest memories together," that when you open it turns out to be blank.
samohkt: My girlfriend gave me a pack of cigarettes because I was trying to quit smoking, and she thought it would help me relax.