Apparently, there is a grilled cheese restaurant (yes) at which, if you are willing to tattoo your body with some version of one of their emblems, you get 20% off for life. Now I'm not sure how that overall savings works out balanced against the cost of a tattoo, but plenty of people do it, if their online gallery is any indication.
My coworker is going there at the end of the month, so he commissioned me to design a Melt tattoo for him.
Oh hey the final tattoo! (little less detailed but still cool)