Hair Cuts at Great Clips (or where ever) do you tip?

I cut my own hair till I have to go some where that some one is setting our standing behind me, I have to agree with Daredevil on this one, if the conversation is good she get's a 5 dollar tip, if she don't smile and talk to me she get's a 3 dollar tip, but lets face it, it takes every bit of 3 minutes to cut my hair. Yes Tip!!!!