Loaning/Borrowing people's equipment.

As a sidenote, it's also not very cool to borrow someone's bike, ride it super aggressively (just because they do doesn't mean you can necessarily control it as well as them - especially your first few weeks) and then rant on about how crap it is or call it a piece of shit. They aren't made to be broken, they're made to play polo (which can break them).

+1 - backwards forks aren't for everyone, but I love my bike!