Just Post

That's how Garry Hoy died:

In an attempt to prove to a group of prospective articling students that the building's glass windows were unbreakable—a stunt he had performed without incident many times before—he threw his body against the glass. True to Hoy's assertion, the window did not break; instead, the entire window yielded whole, popping out of its frame, and Hoy fell to his death.

https://en.wikipedia.org/wiki/Death_of_Garry_Hoy