The sadism bike of sneaky tripping

So I'm walking to class this evening, and this man speeds by me on a bike. It looks like a bar is poking out from one of his wheels. When I look closer I realize it's a single training wheel on one side. But this was my thought process before realizing that:

"What kind of sick bastard has a stick poking out of his bike's wheel? He could trip someone! He's passing an old woman; what if he.... that sneaky.... oh, it's a training wheel."

I liked my hypothesis better than the truth even though it's horrible.