My department sent me to a week long IMPBA certification course to become a bicycle patrol officer. During the course, the instructor made a comment about never using your front brakes while riding down stairs. It makes sense, you hit the front brakes, the bike stops, and you flip over the handlebars and break something. However, me being me, spent the next two years wondering what would happen if you hit your rear brakes while riding down a flight of stairs. So I tried it, which resulted in the bike stopping on the stairs, me saying "OH S**T", flipping over the handlebars, and breaking my collar bone.