Cops have a very specific need to get other drivers on the road the hell out of their way. As commuters get increasingly jaded, cops need increasingly bizarre sirens.

This siren from one of London's Metropolitan Police BMWs sounds something like a hyperactive alien chihuahua yapping at cars up ahead. It sounds weird enough to surprise lazy cars into action.

What's the coolest police siren you've ever heard? Post videos you can find and your best phonetic descriptions in Kinja below.

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