Ethnic Vagina Finder
The Great Paper Chaser
That shyt caught me off guard when I first saw it on the card reader as I had just went in there a few weeks ago and it wasn't there. It also makes it rather awkward at the register as they are staring at you the entire time you're determining a tip amount and you can tell by their tone if they are happy with the amount lol.
It's not just restaraunts. A lot of small businesses are using Square or Clover and they program them to ask for tips. You can't do that with traditional POS machines.