Jeremy Piven
He played a pretty slimy Hollywood douchebag on Entourage but his character may not be too far from the truth. Back in 2007, when he was still relevant, Jeremy Piven showed up to the Aspen outpost of Nobu with his own entourage in tow, and they were seated at the busy haunt without a reservation. Seems like great service, right? Well, Piven didn't think so. On his way out, he told a manager "Thanks for nothing," and left something worse than nothing as a so-called tip: a signed Entourage DVD. Afterwards, he was reportedly banned - for good reason.
[Photo via @jeremypiven]