About Dinghy's Beach Bar & Grill and tipping. The only mandatory service charge that they put on their bills is for parties of 6 or more and that is a 20% fee. I have confirmed that with Jake and a copy of the relevant exchange is posted below along with their menu... It is quite possible that an honest mistake was made to Pat & John's bill. I would hope, that if they happened to return and mentioned it to Jake, that he would hopefully find someway to correct the situation. Again, honest mistakes do happen and that is no reason to trash a business.