[DOORBELL rings]
The Big Bang Theory Season 12, Episode 16
(DOORBELL RINGS)
The Big Bang Theory Season 4, Episode 24
(DOORBELL RINGS)
The Big Bang Theory Season 4, Episode 19
[DOORBELL RlNGlNG]
Breaking Bad Season 4, Episode 2
[DOORBELL rings]
The Big Bang Theory Season 12, Episode 16