So, um, yeah, maybe leave the fireworks to the professionals.

The YouTube description succinctly sums up what exactly happens in this NSFW video:

This is what happens when you set off a mortar shell (artillery shell) in a Garage."

As one of the yokels who pulled (or failed to pull) off the stunt tells us, "Don't do that." No one seems to be seriously hurt, although it does sound like one of the guys may have injured his funny bone, what with all the laughing he does. Perhaps they should've done a little more research to see how fireworks operate.

This is definitely America at its not-so-finest. Somewhere, we'd be willing to bet the Founding Fathers are rolling over in their graves, if for no other reason than to get out of the way of any other yahoos who think they can safely set off fireworks.