Lately there has been a sort of viral trend of clowns with guns, which reminded me of this video:
(NSFW due to what might appear as gore even if it's not)
So, obviously, it's night, and you see such a character with a mallet or a sword or a gun appearing to be killing someone right before your face. Sure, it's a prank, nobody died, as it's a mannequin in disguise that got hit, but you have no way of realizing that on the spot, now do you?
And then said murderer (what appears to you) comes after you. What happened if you pulled a gun and shot them? or knocked them down and they'd break their skull on pavement? Or something like that? Would you be guilty of murder or would it be self-defense? Would you go to jail or walk free?
I know what you're thinking "call the police!" but... you just saw someone apparently get killed and the killer is coming after you, all this in the timespawn of 30 seconds, you don't have time to call the police now, do you?
This is not about clowns in particular, but about pranks like this, with what appear to be murders and such.