[mkrusedc]

I feel your pain and have been there and gone there myself, but be careful with the retaliation. The entitlement society also knows that if you hit them for misplaced gum you are wrong in societies eyes. Kick his a*# without witnesses or make sure he throws the first punch otherwise you are the aggressor and can get accused of battery.

edit: ...or even better do what lincpimp said above.