I've heard the phrase "shoot yourself in the foot". Here's an example.

[Arkansas Granny]

Man Thought Steel-Toed Boots Would Stop a .45-Caliber Bullet

It doesn't take a smart person to guess it would be a bad idea to shoot your steel-toed boot with a .45.

We can thank this guy with a grimace for teaching everyone how bad of an idea this was.

"This guy and his co-workers were discussing whether a steel toe boot would withstand a round from a .45, so what do do you think would be the best way to test this theory? YUP, you guessed it. Good thing he wasn't testing his hard hat."

https://www.google.com/amp/s/www.wideopenspaces.com/graphic-stupid-guy-thought-steel-toed-boot-would-stop-a-45-bullet/amp/

Graphic pictures at link.

[Enterstageleft]

1. Darwin?

Try your tin-foil helmet next, DF.

[3catwoman3]

2. Graphic picture, indeed.

What a fooking idiot.

[abqtommy]

3. It's probably a bad idea to shoot yourself in the foot when you have your foot in your mouth, too.

I guess millions of years of evolution is wasted on some people!

[Archae]

4. There's a group of guys on social media...

Who take a picture of a loaded pistol pointed at their 'nads.

Yup, one guy's gun did go off, he now does a great Michael Jackson imitation.

[onethatcares]

5. hell, he's too dumb

to find his toes, he got what he deserved.

[sarge43]

6. Might have taken the boot off before testing the hypothesis ....

Oh never mind.

[JustABozoOnThisBus]

7. The article indicated that he shot behind the steel toe shield.

So, he didn't actually test his theory.

He could still be right about the protection. I hope he heals quickly so he can re-run the test. Scientifically curious minds want to know.