“Blood Pageant” (* out of four) was a disastrously lame horror comedy about a cheesy reality show in which the various actors (Chris Gilmore, Anthony Sands, Beverley Mitchell, and others) find that their set is being stalked by a maniac slasher who seems to have watched “I Know What You Did Last Summer” and “Halloween” one too many times. Relentlessly dumb attempt to satirize reality television and combine it with a horror movie; it’s not a good sign in a movie when you’re rooting for the killer and waiting for all the annoying characters to die. Snoop Dogg, Stephen Baldwin, and Danielle C. Ryan pick up a couple of extra bucks in superfluous cameos.