Fun with insulation

My apartment building isn't very tightly built, so last weekend I got a spray can of insulating foam for filling gaps where drafts come in. When I was done with it, in accordance with the instructions on the can, I set the can upright and let the foam in the dispensing tube cure. But the foam kept coming out.



It didn't stop until all the material was evacuated from the can. Creepy looking, huh?