The most intimidating firearm I've ever seen was a .22lr revolver that I didn't know enough about guns at the time to identify the make. I was 11 or 12 and a neighborhood bully and his friend walked by my front yard while I was hanging out with a friend and they decided to pull it out and have some fun seeing our reaction to having a gun pulled on us and threatened us for a minute or two before walking away. After the cops were called the sidekick must have been pretty scared (I'd have been scared knowing what they did and seeing a dozen cop cars in our sleepy suburban neighborhood, knowing they were there for them) because he knocked on our front door the next day and apologized to my mother (I wasn't there) and claimed it was a pellet gun, but when the police searched their houses there were no pellet guns and the bully had a .22lr revolver in his room matching our description of the gun so they determined that was the gun.
I'm surprised I didn't have to change my underwear that day, I did see my friend try to run away so fast that his feet couldn't get traction on the wet grass and he looked VERY cartoonish, and I learned for the first time that in a real situation I am very much in control and do pretty well.