Doppler Effect

At 7:05, the boys knock on Penny's door, with Leonard dressed as Frodo, Sheldon as the Doppler Effect, Howard as Peter Pan nee Robin Hood, and Rajesh as Thor - not the Marvel character, the actual Norse God. I beg to differ, as the Norse God is depicted as a redhead with a beard and Rajesh clearly sports a blonde wig and no facial hair, but I'll let it slide. Penny tries to explain to the boys that no one is there because no one shows up at the time the party is supposed to start, and in fact she is not even in costume yet, but they are socially unaware enough to not understand her point, so she lets them in and goes off to get ready.