Tit for Tat

Hey older guy on the bike path, I didn't cut you off and what were you sorry for?  Line jumping?  If you knew it was wrong, why do it? And, for the record, if you think the world is a giant game of tit for tat, which it isn't, if you don't tit no one else will tat; however, if someone tats because of your tit, you really can't complain, can you?