In X-Men: First Class, you meet a young Magneto before he becomes the evil enemy of Professor X. There’s a scene in the movie where he is forced to use his powers to move a 5 Reichsmark coin but he can’t move it. This part of the movie is very confusing because it’s not very likely that what is supposed to be a super-strong character can’t move a small coin. However, it’s important to remember that Reichmarks were made of silver, a very non-magnetic material. Considering that silver has this property, suddenly everything makes more sense, especially since he was just starting to discover his true potential.