Here's what audiences saw in First Class: Professor X and Magneto go to a strip club to recruit Angel. She invites the two of them into a back room for a private dance where Magento says, "We'll show you ours if you show us yours." He's talking about mutant powers, of course, and shows off his own abilities by levitating a champagne bucket. What viewers didn't see was the next part of that scene. Because, once it's time for Xavier's demonstration, he plays a funny little joke by making Angel see Magneto in a wig, sparkly blue dress, and tights. While there's a degree of humor there, the cut portion of the scene is genuinely superfluous; only one power needs to be shown for the point to be made. Besides, Fassbender doesn't have the legs for that dress.