[GreenHornet]

Thee's also Sheldon's love of trains, Howard's unseen mother, and Raj's inability to speak to women unless he has been drinking.

A lesser used running gag: there's been a couple of episodes where Bernadette starts screeching in a voice uncomfortably similar to that of Howard's mother.

[dangus]

I LOVE it when she does that. (My wife would do that before Bernadette even started.)

[C. Edmund Wright]

True…and let’s not forget the not so veiled references to Howard’s apparently small package…..the “dont want to be seen naked by other men” meme….