One thing I hate about this show: An overused phrase

I've never seen a show where the characters SO OFTEN say a variation of "What are you doing?"

Like Leonard... Every time I see him enter a room and Sheldon's doing something weird, and he gets that confused face that shows the abused phrase is coming... I cringe a little bit.

You'd think by now he would expect Sheldon to be doing quirky crap.

Help me post all the variations:
WHAT are you doing?
What ARE you doing?
What is going on here?
Enjoy... Whatever this is.
Why would you do that?
Why would you say that?
Etc...