When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Also, Leonard is shocked that Penny doesn't remember their first kiss.
Trailer
Guest Cast

Pamela Adlon
voices Halley
Rati Gupta
as AnuCast Appearances

Kaley Cuoco
as PennyEpisode Discussion
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Funnies episode in years.
I actually laughed out loud.
I hope we get more like this.
This episode was actually funny the entire time, that hasn't happened in a while. :) And you'd think Sheldon would be flattered by Wolowitz's imitation of him, since he didn't go all nasty like Amy did of Bernadette. Or Sheldon did of Wolowitz.
Two Sheldons for the price of one. :)