The results of their explosive experimentation proved fruitful. The first attempt, firing one Maltesers chocolate malt ball, carved through the watermelon with impressive strength. But the fun really starts at about 2:35 on the video, with their second attempt -- firing two at the same time. The resulting explosion flung bits of pink watermelon flesh as far as 30 meters (98 feet) away from where the fruit and cannon were set up. The Slow Mo Guys mats were littered with giant chunks of the stuff.
"You'd need to use a sledgehammer to get that effect as a human," Gruchy commented. And you'd need a pretty fast swing to make it splatter 98 feet away.
They also shot the chocolate malt balls through soda cans, a ping pong paddle, vases, and -- perhaps most beautifully -- three panes of shattering safety glass. Watch the rest and marvel at the terror of explosive science.