
They're just doing
a BACKGROUND check on me.
The Big Bang Theory Season 4, Episode 7

We'd have
the same cultural BACKGROUND...
The Big Bang Theory Season 1, Episode 2

And the absence of BACKGROUND noise may
mean they weren't calling from the street.
Money Heist Season 3, Episode 4

I mean, they're highly-trained educators
with BACKGROUND checks.
The Big Bang Theory Season 10, Episode 21

...freeing my prefrontal cortex
to work quietly in the BACKGROUND.
The Big Bang Theory Season 3, Episode 14