I was at the Loft in Perkins Row, and they have two for one signature drinks
look, i don't work there but i do know someone that smoked a cig outside with rob pattison once at the loft.
don't know how much their sig drink costs, but lets just say they're $10...you get 2 rounds of 2 drinks totaling $20 for the 4 drinks.
i would probably tip her $5 on that...the waitress knows that, but is thinking that i'm getting $40 worth of drinks for $20 and wants her 20% tip for the cost of 4 drinks, not 20% for 2 drinks & 2 freebies...hence the 40%.
i hope that clears everything up.
also, why don't these places make their waitresses wear slutty uniforms anymore?