You're a real good PAL.
The Big Bang Theory Season 12, Episode 2
What's up, PAL?
The Big Bang Theory Season 12, Episode 8
But you can PAL around with a hagfish?
The Big Bang Theory Season 9, Episode 9
Thanks, PAL.
The Big Bang Theory Season 2, Episode 13
My pen PAL in Somalia
was kidnapped by pirates.
The Big Bang Theory Season 5, Episode 15