Before you read on, watch the above spot in full screen. If you have heart problems, maybe avoid this clip altogether.

Good? Okay, “Spoiler Alert” and all that. The above spot comes from Leo Burnett’s London shop and is part of the UK’s Department of Transportation campaign, “THINK!” It’s pretty damn terrifying, watching a bloodied head come crashing through glass.

Unfortunately, the press release ruins some of the magic by telling us that the guys in the bathroom are actors, as there are probably some rules about pulling this prank on unsuspecting citizens, especially if they’re at risk for a heart attack. In any case, pretty effective messaging. Oh, and don’t drive drunk this weekend. Credits after the jump.

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