
...would be
Anything Can Happen Thursday.
The Big Bang Theory Season 2, Episode 20

Guess who's gonna be
at the comic store on Thursday.
The Big Bang Theory Season 3, Episode 16

Anything Can Happen Thursday.
The Big Bang Theory Season 7, Episode 21

Thursday nights
I eat pizza from Giacomo's.
The Big Bang Theory Season 2, Episode 6

Let's see. Today's Thursday.
The Big Bang Theory Season 2, Episode 6