They're on a
celebrity BUS tour.
The Big Bang Theory Season 12, Episode 18
Yeah, that sounds fun!
A party BUS party don't stop!
The Big Bang Theory Season 9, Episode 13
Why? What BUS?
One that takes them back to Honduras.
Breaking Bad Season 4, Episode 6
People move away from her on the BUS.
The Big Bang Theory Season 2, Episode 12
So, I drove for hours
by BUS to a Star Trek convention
The Big Bang Theory Season 5, Episode 5