The most surprising part of this terrifying clown video is that there weren't more heart attacks involved.
Clowns are inherently creepy, but they look like benign teddy bears next to this whistle-while-you-murder monster created by the Italian comedy group DM Pranks.
The pranks were filmed in the Italian city of Perugia and progress from a homicidal garage bludgeoning to a tense, hair-raising gas station scene that ended when the terrified potential victim pulled out a knife to protect himself.
The cameraman told the Daily News they came clean to all but one of the victims—the man pictured in the Metro station scene apparently took off running so fast the crew wasn't able to catch up with him.
Which is a valuable lesson when it comes to clowns—when you see them don't walk, RUN.