Had another one, a guy I knew, and knew to be somewhat of a tool. Handed his .25-06 over the counter to me. Force of habit, I cleared it. It was loaded. I grabbed him by the collar and pulled him halfway over the counter and whispered in his ear" Tod, I should shove this up your ass and unload it..."
Call me Mr. Tact again.
Trust me if you are in the business you learn quickly to clear every weapon you touch, every time you touch it. Period.
I know a guy who got too busy or distracted or whatever and forgot to clear a pistol he took in on a trade. He put a 9mm bullet through his left index finger. Luckily, the bullet went through instead of taking off the finger. The only other casualty was the credit card machine.
