Are you wearing FULL - AUTO Shoestrings?
From Say Uncle:
"You can apparently take a semi-automatic AK type rifle and attach 14 inch long shoestring with looped ends, loop one end around the trigger and attach it to your finger, then tie the other end to the cocking handle to increase the rate of fire. As such, the ATF has ruled that such a shoestring is classified under 26 USC 5845(b) as a machine gun. It is therefore contraband if not registered under the National Firearms Act."
"Seriously, read the letter from the ATF’s Firearms Technology Branch here."
ATF's got too much time on their hands, maybe?