Tim McGraw and Faith Hill have been married for 20 years, so it goes without saying that they know each other pretty well. Apparently Ellen DeGeneres still needed to be convinced and challenged the longtime couple to play a round of Never Have I Ever during her show on Friday. In addition to learning that Faith and Tim regularly use each others' toothbrushes and never send nude selfies, Ellen ends up asking them a question that leaves them in total hysterics. We'll give you one clue: it has to do with wax. Watch it above!