My friend who is too hip for brakes, but a non avid cyclist, was cruising down a parking garage with me. I was skidding, skipping, and going real slow to avoid problems(I also have a front brake), he couldn't slow down, and started going about 15-20KPH, he just missed a huge support beam, and ran into the parking garage wall, smashing his face up on a metal rain guard. His fork bent back like 4 inches, and I had to spend 20 minutes pulling it back to normal form.

This is where three famous quotes were made

"Just goes to show my bike is bulletproof, its perfectly fine now"
"I'm still going to ride no brakes" (keep in mind he can't skid either)
"I'm not going to get a new fork, it probably won't break"