When ordering @ Olive Garden:
At least one person get the unlimited soup, another get the unlimited salad.
💥 💥 💥... Both now have unlimited soup AND salad.
I was trying to hammer home this tricky life hack with the wife one time while on the sly, so nobody heard... A server cleaning a table nearby overheard and said: "Yup! That's the way to do it!" So.. Even they know it's done.