ice mix
(N.) A non-existent mix requested from new initiates at local restaurants for the delight of the rest of the staff, i.e, a prank at the expense of the young and naive.
Seasoned Server: Hey new guy, I think the bar said they were low on ice mix. Do you think you could drive to our other locale and pick some up.

Trainee: Sure, sure. I got it. No problem.

Seasoned Server: (Trainee arrives with a bag of ice mix) Seriously. You are killing man. Ice mix? SMH.