Love it! When someone throws a ciggarette butt out, it's great fun to throw it back in and watch them freak out trying to find it! I used to do this for a while but figured it would eventually land me a broken nose. Now any time i see someone doing this i just yell at them like the town idiot "hey mister - you dropped your cigarette/coke can/wrapper! :o Everyone turns and stares at them and they walk away ashamed.
This is the best way to stop the moron's - shame them into reality!

