...suggest that Leonard is humorously
mocking your efforts in space PLUMBING.
The Big Bang Theory Season 2, Episode 22
I'm quite familiar
with PLUMBING.
The Big Bang Theory Season 7, Episode 2
You said the casita has PLUMBING?
Breaking Bad Season 4, Episode 3
and not pick up a few things
about PLUMBING.
The Big Bang Theory Season 10, Episode 4
...but it's nice to know
everything's okay with your PLUMBING.
The Big Bang Theory Season 4, Episode 18