Waiter: "Can I get you guys's orders?"

Non-standard (as written: "you guys' "), but speakers notoriously add extraneous " 's"s.

(Sidenote: when we were teenagers my sister and I referred to one pastor as "the polytheist", because he always said "in Jesus's name", which we chose to interpret as "in Jesuses' name". God, I'm a nerd.)