
This made me laugh. We used to live in SoCal, but now live in Virginia. Our good friends from SoCal now live in New Jersey. When either of us visit an In N Out while out West for whatever, we tease each other about it. For example, our friend went to SoCal for business. We received an envelope in the mail with no return address, no note of any kind. The envelope contained only an In N Out placemat.

We instantly knew Frank had been to SoCal!
We did a similar thing to him. We went to In N Out and took pictures of each other biting into our Double-Doubles, but the pics went only nose-high. There were no identifying factors in the pics. Just hands hold burgers and teeth biting down. We mailed them to him anonymously.