So there is a place I like to go to about once a week. For their happy hour, they charge $5 drinks, and I always get two drinks, and they charge me for one, so I give a $10 tip. Occassionally, they want to give me another drink that they want me to try in the past, and this past time they gave me a dessert, just like that. So I would give them an extra couple of dollars on top of the tip when they do that. ... Is that the right thing to do? These guys are really nice, so I don't want under tip them when they do something nice like that, and it is a place I do go to once a week, so even if my budget is crappy lol that I do the right thing. What do you guys usually do and what usually is the protocol when they want to give a little something extra nice like that? Thanks all!!