
And how you threw up
in zero GRAVITY,
The Big Bang Theory Season 7, Episode 16

...for this university's
six-loop quantum GRAVITY calculations.
The Big Bang Theory Season 6, Episode 9

Besides disrupting the local GRAVITY field.
The Big Bang Theory Season 1, Episode 6

And, of course, it's Gravity Probe B.
The Big Bang Theory Season 1, Episode 13

Ah, GRAVITY--
thou art a heartless bitch.
The Big Bang Theory Season 12, Episode 24