After all the chaos caused by Henry Cavill's mustache during Justice League's extensive reshoots, many fans were left asking themselves the same thing: Why couldn't Cavill have simply worn a fake mustache for Mission: Impossible -- Fallout, instead of having it digitally removed for Justice League? Well, according to M:I6 writer/director Christopher McQuarrie, a fake mustache simply wouldn't have held up to the laws of physics.
On Twitter, a fan asked McQuarrie why it was "so important for Henry Cavill to have the real mustache," to which McQuarrie replied, "Fake mustaches don't stay on at 100 mph," presumably referring to one or more of the film's stunt sequences.
Cavill, of course, grew the infamous mustache for his upcoming role in McQuarrie’s M:I6, for which he was contractually prohibited from shaving his facial hair. Naturally, this caused a number of problems for Warner Bros. when Cavill was called back in for additional photography.
This isn’t the first time the actor has addressed the entity known as Henry Cavill’s Mustache. He first broached the subject in July, soon after reports of the complicated Justice League reshoots, writing, “There has been no discussion over whether to shave or not to shave for the JL reshoots, simply a relentless campaign to put an end to the seemingly inexorable conquest of this despotic ‘stache. It is not a question of IF I should shave — it is a question of how can we possibly be victorious against such a beast without bringing our own doom raining down upon us.”