i have had a few. on my old mod (i took the seat off) i sidehopped off the top of a picnic bench clearing the seat bit and when i landed i slipped off the pedal and the back end bounced up and the frame hit me in the guch and another bad one was on my zebdi, i hopped onto a planter went to kick to the other side, the chain slipped so i only just made it so i went to hop back off it and as soon as i landed the bottom bracket axle snapped clean taking a chunk out of the taper on my middleburn