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(Jan. 25, 2016) – Some friendly Twitter sparring between Burger King and Wendy’s took a decidedly unexpected turn that left one of the fast-food chains with some serious grill marks.

This started a few days ago when Wendy’s touted its “4 for $4” deal, which includes a Jr. Bacon Cheeseburger, fries, four chicken nuggets and a drink.

The 4 for $4 Meal: a trayful of mouth-filling glory. pic.twitter.com/JjDOFZVXuP — Wendy's (@Wendys) January 20, 2016

Fair enough, right? The tweet got the attention of Burger King, which offers a similar deal. BK’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.

5 for $4, because 5 is better than 4. pic.twitter.com/BZe8JFbKjm — Burger King (@BurgerKing) January 21, 2016

Seems like a reasonable response between a couple friendly rivals, right?

Then Wendy’s took things up a notch with this tweet to a customer that left Burger King flame-broiled: