A little public display of affection could get you and your sweetie some free food on Valentine's Day.

Qdoba, a nationwide chain of restaurants, is bringing back a Valentine's Day promotion that, according to spokeswoman Ashley Cohen, tens of thousands of customers took advantage of in 2011.

Anyone who buys an entree can get another for free—once they kiss a fellow customer at the cash register. It doesn't matter (to Qdoba) who it is.

O'Fallon's Qdoba is located 2285 Highway K.