When "Entourage" hits theaters on June 3, it comes with a boatload of celebrity cameos, including Liam Neeson and Tom Brady. This is both a tradition for the HBO series-turned-feature film and for Hollywood itself, having stars pop up unexpectedly in films -- especially in "The Muppets" and any comedy with Will Ferrell, Ben Stiller or Mike Myers.

It was hard work, but we narrowed down our list of movie cameos to some of the biggest, most memorable cameos of all time. SPOILERS, obviously, for "This is the End," "Zombieland," "Anchorman 2: The Legend Continues" and more.