Last year’s DC superhero team-up Justice League was a disappointment on many levels–from the terrible reviews and fan indifference to the woeful box office that lost Warner a reported $50 million. But there is one element that the movie will be remembered for–Superman actor Henry Cavill’s mustache, which had to be removed by CGI. Now Justice League co-director Zack Snyder has himself poked fun at the terrible VFX that gave Cavill his bizarre top lip.

Snyder posted an image of himself with a scruffy beard on the social media platform Vero, where he frequently posts pictures and interacts with fans. Snyder accompanied the image with a suggestion that he needs to shave, to which one fan inevitably replied “you could just remove it via CGI.” Synder’s reply? “We all know that doesn’t work.”

Snyder had in fact quit the production of Justice League by the time the mustache issue came up. He left the movie in May 2017 following the tragic death of his daughter, with Avengers director Joss Whedon taking over reshoots and post-production.

By the time additional footage of Cavill was required, the actor was already in production on the upcoming Mission Impossible: Fallout, for which he is sporting an impressive ‘tache. With Mission Impossible producers Paramount unwilling to let the actor shave for the Justice League reshoots, Warner was left with no option but to attempt to remove it in post-production.

Although Justice League was a box office failure, there are still plenty of other DC movies in the works. Aquaman hits theaters in November, and Shazam is now in production. Beyond that, Wonder Woman 2 will be released in November 2019, and Suicide Squad 2 is expected to start shooting later this year.