
that the second Thursday
of every month,
The Big Bang Theory Season 5, Episode 12

The whole idea behind
Anything Can Happen Thursday...
The Big Bang Theory Season 2, Episode 20

or the third Thursday
in a month with five Thursdays,
The Big Bang Theory Season 5, Episode 12

...has its own version
of Anything Can Happen Thursday.
The Big Bang Theory Season 2, Episode 20

That you said you might introduce me to.
I'm free on Thursday.
The Big Bang Theory Season 9, Episode 8