Forget it. Your cane will never smash that thick glass. You'll need something super-heavy... like that big wrecking ball up there.
― Bentley telling Sly how to get to the treasure key[src]
Sly took an elevator to the roof of Muggshot's casino. Ahead of him was the treasure key, which was in a glass skylight. To free it, Sly had to do some serious climbing to reach the wrecking ball above the skylight and use it to smash through the thick glass. This provided the perfect opportunity for Sly to try out his climbing move on several neon lights.
You'd need an I.Q. of at least 140 to figure this one out. Dial in 4-6-8.