
- Sorry. I had to CLOCK out.
- Oh, no, that's okay. Ahem.
The Big Bang Theory Season 4, Episode 4

I power a CLOCK with a potato.
The Big Bang Theory Season 6, Episode 22

has got my biological CLOCK
ticking like crazy.
The Big Bang Theory Season 11, Episode 17

Oh, yeah. The Mr. Spock cuckoo CLOCK.
The Big Bang Theory Season 10, Episode 10

couldn't power a potato CLOCK.
The Big Bang Theory Season 10, Episode 12