Instagram guy Stevothemadman1 and his buddies were filming a sketch on the streets of Birmingham called "How To Avoid Getting Robbed." (The HILARIOUS secret? If two guys point guns at you, pretend to be mentally disabled to a cartoonish degree and the assailants will let you go.)
To the filmmakers' credit, it must have looked like a real robbery was in progress, since armed officers quickly descended on the scene with weapons drawn, forcing Stevo the Madman and his comrades to hit the cement.
Here's the completed thing, in case you're curious:
And our own Brendan Bradley's take, because you know we had to chime in: