It said right there on the INVITATION,
"Buckle up for fun!"
The Big Bang Theory Season 10, Episode 19
It's an INVITATION.
Game of Thrones Season 7, Episode 6
I already rejected her savior
and her LinkedIn INVITATION.
The Big Bang Theory Season 11, Episode 12
What INVITATION?
The Big Bang Theory Season 2, Episode 9
By accepting the INVITATION...
The Big Bang Theory Season 4, Episode 22