I've got to confess something: Most of the riffs I've listened to thus far haven't really given me any true belly-laughs; you know, where you're laughing so hard you can't even breathe. I've had a chuckle here, a smirk there, but nothing that killed me outright.
...until Mike's line, "My review of Avatar!", as Jake Sully is making an update to his computer journal. Mike's reedy, snotty, pubescent delivery was divine.