Beach Burger

Beware! I went in with my wife and 3 other friends. The restaurant only takes cash, so because I was the only one with cash I offered to buy our 3 friends their meals. I paid and then asked for a receipt, which the cashier did not originally provide. As she was printing the receipt she told me she added gratuity because we were considered a group. Keep in mind this is a fast food restaurant. I looked at my receipt and she charged me 20% gratuity, totaling $14.25. There was no sign posted saying this, at no time did the cashier tell me this while I ordered and it makes no sense since this is not a sit down restaurant. Felt ripped off and taken advantage of because I was not a local. Will definitely be reporting this practice to the better business bureau.