Sometimes the freebie tie-ins make more sense than others. I'm not exactly sure what the connection between free french fries and St. Patrick's Day is... potatoes, maybe? Not that it really matters! What's important is that you go to Burger King on March 17-18 and claim your free fries, complete with GREEN KETCHUP. Excuse me, "St. Paddy's Day sauce."
If you also swing by McDonald's for a shamrock shake, you'll have quite the festive snack.