This had to be Sheldon's best performance all year. The idea of him being a teacher is nothing short of hilarious and his execution was both flawless, and shockingly realistic. I don't think I've laughed at hard as I did while he was writing on the computer as I have during this show in a long time.
That's not an excuse for the Leonard, Howard, Howard's girlfriend stuff though, which bored me to tears. The Big Bang Theory usually has one good storyline and one bad one, and you guessed it, the bad one involved Leonard yet again.
Very little Raj tonight in this episode. Luckily Sheldon was so funny that I have to score this episode highly.