Best shrooming experience for me (I've only tried it twice, and once maybe the weed was laced with them) was watching Lord of the Rings: The Return of the King on an eighth with some friends. I know I was severely fucked up but I also kept freaking out my friend Al. I'd turn to him with this creepy grin and he'd flip out at me;

Al: "FUCK YOU MAN, STOP THAT! I am WAY too fucked up to deal with that!"

Me: [in creepy british accent, a la "salad fingers"] Stop what, Alan? What am I doing?

Al: [flips out and starts hitting me]

Me: You must be hallucinating Alan. How frightening this all must be for you...etc.

Yeah maybe I'm the only one who thought that was funny but you should have seen how badly freaked out he was.