Corrected entry: When Sheldon mentions to Leonard, Raj, and Howard that he is moving out, Raj asks Leonard "Did you pronounce the 't' in often?" This statement in context implies that it makes Sheldon angry when someone pronounces the 't' in often. However, Leonard and other characters do this multiple times throughout the series with Sheldon never commenting on it.
Ashish_Agrawal
3rd Nov 2017
Correction: Sheldon is also very particular about things in certain episodes. It's not out of character for certain ticks to disappear and reappear throughout.
Ssiscool ★