Things got festive on SNL this week with host Katy Perry, and the holiday spirit went beyond the Christmas tree dress she wore in her monologue. Perry teamed up with Andy Samberg for the digital short "Best Friends," but it wasn't just a party of two — Matt Damon makes an appearance as a "handsome drug addict" with some hilariously long hair and gross teeth. He's not the only famous face that shows up either; things get even weirder when Val Kilmer enters the picture. Watch!
