In the film Ant-Man: The Ant Man, Scott Lang is one of those thieves half-hair who spend more time in jail than outside, since the police always gives them because of the shoddy they are. In the movie we will see Scott coming out of jail.
Once out of jail Scott receives a very mysterious call from Dr. Hank Pym. Scott responds, because he has nothing to do and the scientist gives the thief a very special suit.
With his suit on, Scott can reduce his size a lot, to be as small as an insect, but he does not lose strength, but instead, the suit gives him much more strength than he has.
Scott has a gun in his hands, and maybe he’s not the best person to have it. However, it seems that the confidence of the teacher changes and the thief gives way to the hero inside.