The "X-Men: Days of Future Past" actors can have some fun in the set. Despite the grim and intense themes of the movie, they can talk about light moments once director Bryan Singer yells, "Cut!"

James McAvoy got the coveted role of Professor X, the young version of the heart and soul of the X-Men in "X-Men: First Class." The movie was only considered a mild success. Thus, it prompted Fox to go back to some of the successful elements of the old trilogy (read: Wolverine) and combine it with the new (read: Jennifer Lawrence).

There would be some curious moments, like the old and new Professor X meeting each other. Apparently, there is no such meeting for Magneto. Speaking of getting old, has McAvoy come to terms that his character will lost the locks? JoBlo asked the burning question in their set visit:

"I think maybe toward the end of a third movie, if we make a third movie, the natural place for my character to go would be to become much more like him. I don't think it should be that he just decides to shave his head. I think it should be for a reason. In the comic books, it was for a reason. He lost his hair as a result of something. It wasn't just like gradual hair loss, do you know what I mean? Which would be so dull, in this world where people can control metal and fucking poison tongues and shit in THE WOLVERINE and all that. It's like, "Hey, how did that mutant lose his hair?" "It just fell out."  We obviously didn't decide to do that in FIRST CLASS, and they obviously didn't decide to do it in this one. We went the opposite way. But I think there's got to be a reason. I had an idea for this movie, but they ultimately didn't go with it, which I thought was fucking cool... I can't tell you, because it might be in the next one. But it involved a lot of violent hair cropping

There is also an infamous incident about Nicholas Hoult getting kicked in the balls. Priceless fun.

"Did he tell you? He finally told somebody? Every interview he's done, he's like, "Sh*t, I forgot to tell them that you punched me in the balls!" I'm glad he finally got that out. It was a total accident. We were doing a shot on me, actually, and we were meant to be reacting to these bright lights and flinching at them, because they were meant to be explosions going off around us. It was like, "F--k! F--k! F--k!" And I just noticed that the cameraman decided to pan over to Nick, and we hadn't been warned that he was going to do that. I didn't think that Nick knew the camera was on him. And he wasn't flinching. So I thought, I'll just smack him, but I was trapped under this truss, so I could only get through to him that way. So I decided to hit him to make him flinch or something like that, and I just went, boom! And I smacked him right in the balls. He thinks it was because I was angry at him, because the camera left me. Which I wasn't."