As the weather starts to warm up, it's a good time to remind ourselves about one of the country's most popular - and dangerous - pranks.
They've been called Works bombs, mailbox bombs, bottle bombs, and Drano bombs, but whatever you call them, they spell danger if you get too close.
Building these nasty science projects has been a popular teenage pastime for decades, but now that there are tutorials on YouTube, they've become even more common.
The basic idea is that a plastic bottle is stuffed with aluminium foil and the cleaning product Drano, or similar household products.
The combination releases gas and heat, which eventually explodes out of the bottle.
For many children, the creation is just harmless fun. But pranksters have taken to hiding the bombs on their neighbor's property, or even throwing them at unsuspecting people.
Even small bombs in plastic bottles can shower victims in corrosive chemicals and shrapnel if they get too close.
Police are warning the public about how to spot one of these deadly "pranks" before they get too close.