While Audi is busy making Qnicorns, BMW and Mercedes got into the Halloween spirit by joking around on Twitter.

BMW USA launched the first salvo with a tweet directed at Mercedes. It showed an E53 wearing an M5 costume and was accompanied by a message saying “Now every car can dress up as its favorite superhero.”

While this was clearly a dig at Mercedes and their mid-level AMG variant, BMW did wish their rivals from Mercedes-Benz USA a happy Halloween. Despite that gesture, Mercedes decided to fire back with an amazing burn.

Related: What Would You Call The BMW Concept 4’s Grille? Coffins? Waffle Iron? Beaver Teeth?

The company replied to BMW’s tweet by saying “Nice one. That’s a really scary costume!” However, they took things one step further by adding “Especially that radiator grille…”

That’s, of course, a hilarious reference to BMW’s ever growing grille. The controversy kicked off with the unveiling of the X7 and continued with the debut of the facelifted 7-Series. However, things really heated up with the introduction of the Concept 4 at the Frankfurt Motor Show.

The concept’s grille is nearly as tall as the front fascia and it has been decried as everything from buck tooth to a monstrosity. While styling is typically toned down for production, spy photos have confirmed the ridiculous grille is really happening.

This caused a revolt from BMW fans who mostly hated the design. Now, we now Mercedes isn’t a fan either.

H/T to Motor1