It said right there on the INVITATION,
"Buckle up for fun!"
The Big Bang Theory Season 10, Episode 19
This isn't an INVITATION, it's a trap.
Game of Thrones Season 7, Episode 2
Came here to King's
Landing at my INVITATION.
Game of Thrones Season 4, Episode 1
What INVITATION?
The Big Bang Theory Season 2, Episode 9