No skateboarding!

This bit of elevated stonework downtown near Proctor's Theatre used to be a popular place for skateboarders to practise grinding (sliding on the body or the trucks instead of using the wheels). Then, no doubt for safety's sake, someone installed these steel balls along the edge, thinking that would put an end to it.

Skateboarders love a challenge, and if you look at the ball, it's clear it's been banged up.