Same thing about 18 months ago at work in the bike sheds.
After a night shift, started the bike, deciding without choke as it was a warm morning, and after assuring it was running smooth, pulled away and started heading out the exit, which needs a sharp right turn to clear a curb and bollards, have done it hundreds of times over the years and do it feet up. Halfway in the turn gave it extra throttle to eject me from the exit, only to have the engine go PHUT and die, stopping me dead, front wheel cranked to the right, leaning over, and feet up!!
We fell over into the metal exit of the shed and fortunately the bike didn't go full over, but was stopped by the back of the seat taking the full brunt. Sharp metal sheeting and vinyl don't match, and ended up with a decent rip for my troubles. I had to dismount and unjam the bike from its predicament, I don't think anyone saw. The rip was repaired professionally and I can't even see where it was now.
Bill.........................;-)