Musicians sure do seem to come across a lot of these, don't they?
The first time I witnessed one of these: Bo Bice (from American Idol) broke his leg at my concert during their tour.
I figured it was a one time deal...until...I saw the All-American Rejects. I actually have found a vid of it as well. Watch this: Tyson is singing Move Along, and about a minute or so( give or take) into the song, someone throws a shoe at him! What the heck were they thinking? I have no idea:
http://www.vidiLife.com/video_play_886914_The_All_American_Rejects_Move_Along_.htm?tc=427531
That one's just down right funny...but I recently came across one of Panic! At the Disco's lead singer Brendon Urie having a BOTTLE THROWN AT HIM. Not quite so funny.

Anyway, here's the vid for that one:
http://www.youtube.com/watch?v=mxS_lLGQ2KE
Anyone else no of other stories, or have other (hopefully amusing rather than sad) videos of things like this happening to musicians during performances? And the even more important question, relating to audience-induced misfortunes...why?
And mods, if this is the wrong place to post this, just lead me in the right direction!