Boy, if good ideas came out of your brain
the way MUCUS comes out of your nose,
The Big Bang Theory Season 10, Episode 19
"MUCUS plug" again.
The Big Bang Theory Season 11, Episode 16
A hagfish can produce enough MUCUS
to fill a bucket in a minute.
The Big Bang Theory Season 9, Episode 9
Has your MUCUS plug popped out?
The Big Bang Theory Season 11, Episode 16