When you buy two drinks and one burger between now and Nov. 23 at Denny's , you can get a second burger & fries meal free. This only works for couples as I doubt they'll let one really hungry person get two burgers.
You might be able to pull it off if you bring a fake mustache though. Every time the waiter comes, move to the other side of the table and say your friend went to the bathroom. It probably wouldn't hurt to throw in a fake accent for one of the characters as well!
[via Zachary – thanks!]