this guy i know glued double edged razor blades behind and around his headunit. he knew how to get the unit out without cutting himself, but of course, nobody else would.

one night he was walking back from the store when he heard this scream coming from his complex. he trotted over to see what was happening, and he saw his mazda's door open, and a trail of blood that led from his half-removed head unit, the car, driveway and down the street.

nobody ever even tried to steal the dang thing again, as he left the little blood stains on the carpet as a reminder of "hand slashin' Mazda".