[DOORBELL rings]
The Big Bang Theory Season 12, Episode 16
Do you think you can just ring
my DOORBELL anytime you want?
The Big Bang Theory Season 3, Episode 16
[DOORBELL rings]
The Big Bang Theory Season 12, Episode 16
Hey, that's sort of like how
you used a DOORBELL camera
The Big Bang Theory Season 12, Episode 12
(DOORBELL RINGS)
The Big Bang Theory Season 4, Episode 19