My dads friend in college put razor blades under his skirts on his 58 Impala so they wouldn't get stolen...again. Someone's mom came after him saying his car cut his 15 year old sons hands. Yeah, no ****! What were his hands doing under there, eh? Looking for his baseball?
I did that around the radio on my 68 after the first time the system was stolen out of it. Found blood in it about a month later but the radio was still there.
