Give it to the orphans.

Phrase letting convenience store clerks know that you don't want to wait the 8 seconds for your change and that they should instead just drop it into the charity bucket after you leave.

Tom: "Just the one 40 of Old English please."
Clerk: "That'll be $2.50."
Tom: *gives $3
Tom: "Give it to the orphans."
Tom: *walks out.