Vince broke his coccyx in a motorcycle accident in the early 90s(I think), then starting taking crazy bumps in his 50s in the late 90s.
Jump ahead to about 35 second in this video and see that HUGE bump he took off the cage against Stone Cold:
Then watch his head/neck on the next one where he gets thrown out of the ring by Chyna.
Dude was a fuckin lunatic. Also had the best developed back in the history of wrestling.