Tim Lincecum has a vicious motion that defies several laws of human mechanics. Apparently he lost his footing because of some loose dirt on the mound, but I’d venture a guess that by virtue of lunging a distance off the mound equivalent to 120% of his height, he dramatically increases the likelihood of falling on his ass. To add insult to injury, The Rockies pitcher, Tyler Chatwood, singled in the runner who was moved over to second on the balk (ya, falling off the mound like a dingdong is a balk).
Timmy gave up six runs in five innings as The Giants lost 10-2.
H/T Big League Stew