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MEMPHIS, Tenn. — Some friendly Twitter sparring between Burger King and Wendy’s took an unexpected turn that left one of the fast-food chains with some serious grill marks.

The banter started last week when Wendy’s touted its “4 for $4” deal, which includes a Jr. Bacon Cheeseburger, fries, four chicken nuggets and a drink.

The tweet got the attention of Burger King, which offers a similar deal.

The restaurant’s “5 for $4” includes a bacon cheeseburger, fries, four chicken nuggets, a drink and a cookie.

So Burger King’s social media team hit back:

That’s when Wendy’s took things up a notch with this tweet to a customer who was demanding a response.

The tweet left Burger King feeling flame-broiled: