Bob has had his fair share of close calls, but here's the top 3:
Bob was trying to break the land speed record, but his bike had other plans. He face-planted onto a cactus.
Bob's bike had an unexpected bout of spontaneous combustion, leaving him with 2nd degree burns on his legs and a strong dislike for fire.
Bob tried to bike through a thorny thicket and lost a few dozen quills in the process.