It’s Lorelai (S5 E2 "A Messenger, Nothing More”)

Luke and Lorela : Cute phone conversations and an "about to kiss" moment interrupted by a marching band!
Lane: She loves Zach but do we???
Kirk: Where was Kirk??
Lindsay and Dean: Yikes!
Lindsay and her mom vs Rory and Lorelai: Double YIKES!

Would you have been "a messenger, nothing more" with that letter? Invisible ink would have been good here.

Did you spot the future celebrity hanging in the diner? We did.

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