A few times:
Children of a Lesser God -
The set was this maze of ramps and platforms and the first tech rehearsal I was so worried about the inexperienced actress playing opposite me that I told her I'd guide her onto the stage for our opening positions. Blackout. Music. They hadn't yet glow taped the edges of the platforms and I walked right into a 3 foot hole, ripping off my big toenail and breaking said toe. What is the sound of a deaf actress laughing?
Bye Bye Birdie -
Hugo Peobody chasing Kim off stage right (like, what, 275 times during the show) - the stage manager had some sort of emergency and was running in an opposing direction. I was 16 and like 120lbs. He was like, well, older, and maybe 300lbs. We collided and I actually bounced, caught myself and snapped my ankle. The rest of the "run" on a crutch.
Jerker-
Opening night stubbed my little toe on a bedframe as the play was beginning, breaking it. No break in the play - I watched my foot technicolor up as the play progressed over the next 80 or so minutes.
"Love Life. Live." Michael Bennett