The bottom of this recent $54 dollar bar receipt from 1 oak says "A 20% service charge has been added for Bottle Service Thank You". Shady indeed. And perplexing of course, because no bottles were purchased. And because there is no itemization on the receipt, it is impossible to tell if 20% was snuck in there or not. Shady element number 2. Certainly a ponderous situation, and one that may give you pause to think next time you open up a tab.