Potential Energy
po·ten·tial en·er·gy
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors. (bold mine)

The contents  inside a spray can are under pressure and thus stressed.

I need to create the Miggy Principle: If you shoot at any vessel or container that Is under or will create pressure , it will come right at you and try to kill you.
And you deserve it.

Hat Tip Ziegfried W.