Struggles of Being a Marvel Fangirl

Quarter

So I just watched X-Men:First Class (one of my favorite Marvel movies) and I started thinking.

How did Magneto pass the quarter through that guys head?

I know that Magneto can control all metal, and the Marvel likes making the impossible possible. But they made it seem like his head was made out of paper. The quarter passed right through it. So if you know how it did that (like if there was some scientific way or something) comment and tell me because I've probably watched the movie 10 times and I still dont know.