Don't laugh, people do just that.
I used to be a frequent attendee of the North Country Machine Gun Shoot (I think the last one was in '93/94?) waaaay up in NH.
You should see the junkers that are donated for the firing line. They're positioned out 100 yards, and the sponsors typically rig 1/3 stick of dynamite in strategic locations.
Once the order on the firing line to "commence fire" is given by the RSO, you can hear the earth shatter "boom" of the dynamite going off. Usually the guys with the belt fed .30 cal's beat everyone to the dynamite.
Lemme go drag up a few pics...
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