Yeah it's always funny except when it's my favorite character that dies. Have you seen Thirteen Ghosts? In that a lawyer get cut in half straight down the middle, when someone finally finds him she says 'Is That Half The Lawyer?' but anyway yeah I laugh at pretty much every horror movie I watch :)
Yeah mostly because the characters can be really stupid. But does Saw count as a horror movie because I laughed during the final chapter...the guy in the last game couldn't save crap. He was the worst player.