Being the horror researcher that I am, I decided to compile a liste of films featuring killer clowns. There's probably some here that you've never heard of before. A few of them are good (You'll already know which ones), but most, not so much.
Not listed in any particular order, except for the first few being the plus familiar ones.
Follows a group of UAC Marines as they respond to a distress call from a haut, retour au début secret scientific base on Phobos, a Martian moon, only to discover it's been overrun par demons who threaten to create Hell on Earth.