Happened to me once when I was racing an R6 6 years ago. I didn't torque the rear wheel nut, but had put my safety wire clip back through the axle so the nut co

Happened to me once when I was racing an R6 6 years ago. I didn't torque the rear wheel nut, but had put my safety wire clip back through the axle so the nut couldn't back off. Got a warmup lap in and started in on a fast lap during a practice session, and it was immediately obvious something was wrong. Limped back into the pits and found the loose nut. I said a quick prayer to the wiring rulebook (and the people who crashed before that rulebook existed), and inspected everything on the bike.