In 2011's science fiction comedy, Paul, two British comic book nerds played by Nick Frost and Simon Pegg encounter an alien outside Area 51 when traveling across America on a UFO pilgrimage.
Original Paul movie costume and props
Personally I love Flash Gordon, so that 'Ming the Merciless' t-shirt is priceless, and the alien in question resembles the look of the 'Roswell Greys', although this is only a stand-in prop for the computer-generated screen version (who was voiced by Seth Rogen).
Plus be sure to check out more screen-used props from Paul from a previous visit to the NBC Universal Experience archive exhibit, and if you're a fan of the comedy duo, you can also check out these costumes and props from The World's End, Shaun of the Dead and Hot Fuzz movies.
Paul movie posterPaul (Unrated & Theatrical Versions)