Went to 50's last week, had a very average dinner, but great service.. Got the bill and the waiter forgot to include a pen, so I set my card in the black thingy and was going to ask for one when he came around, but he grabbed it without me noticing and ran it thru...Short version, it was too late to add a tip with the card, I had no cash, no ATM card and not even a credit card to do a cash advance, just my KTTW.. The waiter was great, said it happens and just asked me to forget about it and enjoy the night, but we still felt horrible!!