When I was a kid, I had a mean trick exactly like that pulled on me. I was shooting .22 magnums out of a Savage .22 magnum/ 20 gauge with one of my uncles. The gun was wearing a scope.
He sent me down to "check the target" and handed me the gun when I got back, telling me it was my turn to shoot. He'd loaded it with a 20 gauge slug. I got the scope right in my eye socket good and hard.
I didn't cry.
I didn't drop the gun.
I didn't turn and hit him in the head with the stock as hard as I could.
It was difficult though, especially with the way he was laughing at me.
That was nearly 40 years ago, but I remember it and I resent it to this day. He's dead and I inherited the gun. Every time I look at that gun, that incident is the first thing that comes to mind.
I'm not normally prone to outbursts, but if I saw somebody pulling such a "joke" on a woman or kid, I believe I'd have to give him a proper au paire-style shaking.