I love Big Bang Theory to bits and believe it to be the funniest thing on TV, just now.
Sheer consistance in writing and acting have kept this series fresh.
However, in this one, they outdid themselves by an unbelievable margin.
Straight from the start, this was out and out belly laugh fare, with Sheldon dropping like a stone on seeing Leonard's get up, after being "primed" by Raj & Howard's excellent pranks.
I've now watched this episode into a double figure number of times and still laugh like crazy when Sheldon smacks himself in the head with the hand buzzer.
I have absolutely no idea why some people (thefanof) didn't find this episode hilarious. I hate to think what he/she finds amusing.