P.R.O.V.E.
Look at the gun and make sure it's not about to shoot you. Check the chamber and the magazine. Then check the inside of the barrel just in case.
"I looked at the gun and still got shot. I'm not sure why.", @GunBroIsDumb
"I checked the chamber and the magazine. Then I got shot in the face.", @GunBro123
"I checked the bore and still got a bullet in the eye.", @GunNoob420"