Easy peasy! Any counter service place that get hella busy, and calls out your order.
1st: dress decently and just lurk on your phone near the pick up window.
2nd: Whenever you’re feeling it, walk up and repeat back the number,”18”! “18”?. “Thanks”.
3rd: walk away and enjoy your free lunch/dinner!
I’ve been doing this for years, never been caught.

*Call me all the names you’d like, I don't give a fuck! (: