Hop, you little plumber, HOP, HOP, HOP.
The Big Bang Theory Season 2, Episode 2
Hop, you little plumber, HOP, HOP, HOP.
The Big Bang Theory Season 2, Episode 2
Go up to the roof, HOP over
to the next building... There's a gap.
The Big Bang Theory Season 1, Episode 14
Hop, you little plumber, HOP, HOP, HOP.
The Big Bang Theory Season 2, Episode 2
"Straight up, Red,
HOP on my flying carpet."
The Big Bang Theory Season 7, Episode 19