“This well-known, ad-libbed quote is from the 1980s film They Live starring then world-renowned wrestler Rowdy Roddy Piper. There's no better way to make your intentions known when walking into a room than by wearing a t-shirt like this.

See the quote in action here: http://videosift.com/video/have-come-here-to-chew-bubblegum-and-kick-ass”