Once, when i was trying to ride my bike home from the bar. Funny how you never think to just walk in these situations. Well, it took about four tries to even get on the bike and get rolling. Then everything was fine. Then I woke up in my apartment with the door open with the bike laying on top of me, my lock in hand, but no key. It easily took 30 minutes to get up because of the incredible shooting pains in my shoulder. Torn ligaments. Lotsa fun.