A lot of them are staged though. 

 Yeah, funny AF until he pulls that crap on someone like me who's carrying. 
"Ha! You brought a chainsaw to a gunfight? BLAM." 

 There's a reason most of these prank videos are done in Europe or leftist shitholes like California.  I don't care if it's "just a prank bro", someone running at me with a weapon is a threat, and they'll be put down as a threat.  Your prank may be the last thing you ever fucking do. 

 Clowns can get up to weird shit. 

https://www.youtube.com/watch?v=6Gha9xrM10w