"Jackass" star Steve-O has been wreaking havoc since an early age.

Known as MTV's bad boy and quasi-professional stuntman, Steve-O is always pulling an outlandish prank or stunt. At 17, things were no different. In the latest episode of "When I Was 17," airing at 11 a.m. ET Saturday on MTV, Steve-O recalls bicycling while intoxicated.

"My way of getting around in London when I was 17 was my bicycle. One night, I filled my glass with some sort of hard liquor and chugged the whole glass," remembers the co-author of the recently published "Professional Idiot: A Memoir." "Every time I did that, something bad happened."

In typical "Jackass" fashion, after chugging a glass of hard alcohol, Steve-O decided to hop on his bike and ride around London.

"The next thing I remember is waking up on the hood of a parked car, which I had blatantly ridden head-on into," he recalls.

Steve-O claims he doesn't recall the accident. Although he didn't get in trouble for BUI (biking under the influence), he ended up with a mouthful of broken teeth.

"My bike was in this mangled heap. My teeth were broken really majorly," he says.

For more stories from the "Jackass" star's youth, don't miss the new episode of "When I Was 17," also featuring Paris Hilton and Miguel, airing Saturday at 11 a.m. ET on MTV.