What would you have to do to make it dangerously explode without the usage of heat/fire? They seem like they can explode but are designed not to cause shrapnel?
Spray cans generally gently vent if overheated... I've never seen a can of wd40 crushed, but a relative ran over a can of spray paint once, and it made a quite nice mess. Took him lots of buffing to get it off his paint...