Only once, when it was in my jeans pocket. I could see a bright spot of light shining through my jeans!
I just turned the shake sensitivity down a bit and never had that problem since. It's very seldom going to happen anyway because the screen has to be turned on first before the shake detection kicks in.
Absolutely true story:
A few months ago on my old phone, my seven year old got a hold of my phone and started jacking with it (he's a smart kid). I collect and listen to Old Time Radio shows from the 1930's, 40's & 50's on my phone all the time. One of those shows is The Adventures of Tarzan. Each episode of Tarzan begins with the famous "Tarzan yell" for about six seconds. Well, my loving son clipped off that yell from one of the episodes, set it as my ringtone unbeknown to me and later that evening I found myself standing in a line at the grocery store trying to decide whether or not I wanted to acknowledge, and therefore feel the need to explain, that loud Tarzan yell coming from my left testicle.
Yes, I still love him.