Buzz Aldrin is one tough dude.

You don’t want to mess with a guy who had the balls to strap himself in a tin can during the dawn of the space age — and then be launched into space to pilot that tin can using less technology than a modern cellphone — and then intentionally crash-land that tin can into the ocean.

If you offered up your body as a virtual Guinea pig so scientists could test the possibility of human space travel, you’d be pretty annoyed to see a movement pop up claiming that your unprecedented life-risking sacrifices were nothing but a hoax.

Conspiracy theorist and moon-landing denier Bart Sibrel found that out the hard way one day in 2002 when he confronted Aldrin outside of a conference in Hollywood, California. After repeatedly provoking and harassing Aldrin, the veteran pilot turned and looked Sibrel straight in the face.

“I know you’d like to get a lot of attention, wouldn’t you?” Aldrin said.

“Well, you’re the one getting money for something you didn’t do,” Sibrel replied. “You’re giving a lecture for walking on the moon when you didn’t. That’s called being a thief.”

As Aldrin turned to walk away, Sibrel followed him.

“Do you think you can get to heaven without repenting?” Sibrel pressed. “Why don’t you swear on the bible that you walked on the moon?”

After repeatedly asking Sibrel to “get out of here,” Sibrel still insisted on getting in Aldrin’s face.

*Crack*

The LAPD investigated the incident, but dropped the charges after witnesses said Sibrel had aggressively poked Aldrin with the bible he was carrying.

Watch:

[This article was originally published on July 20, 2016, but has since been updated]

Featured image via screen grab