Reddit Useless Facts

Reddit user Frozen_Beer posed this simple question to the Reddit community:

"Horses can't vomit. What useless facts do you know?"

One day and nearly 7,000 responses later, our brains are bursting with incredibly useless, albeit oddly fascinating, trivia. We're sharing our favorites here for people who don't have time to sort through them all.

What is the most useless fact you know, that you didn't learn here? Share it in the comments below.