$2 PBRs. Unfriendly bartender. 2 beers.    4.33 total. Tipped a buck.  Usually in a case like that, I try to do a buck for each drink. If the tab starts getting over 40 or 50 bucks, then I do more of a percentage thing.   Thoughts?    Yet, I'm impressed that I only had two beers. Except, I also had like four ginormous gabapentins. Frick I'm feeling fuzzy.