Misconceptions of guns and knives in movies

Discuss bogus things of those and other weapons that movies portray.

When someone gets stabbed with a knife they will pull it out instead of letting a medical professional do it, which is what you are supposed to do IRL.

And whenever they pull it out by some miracle the bleeding has stopped or is not gushing out like a waterfall.

Whenever the good guy is shot he just brushes it off as if he wasn't and there is no pain at all.
While just one shot against the bad guy brings him down.

Someone who does not have a job handling firearms or never had any experience with them before will be put into a situation where all of a sudden they have to handle guns and knows everything there is about the weapon and can shoot and hit their target with no problem.
They make it look like as if handling a gun is as easy as drinking out of a straw.