This is a video of Youtube prankster Reuben pranking his girlfriend Rebekah with an exploding ketchup bomb (made by pouring sodium bicarbonate into a squeeze bottle of ketchup). Apparently these two go back and forth pranking each other all the time because that's how you build a healthy relationship that never ends in murder. That's your own house -- you live together. What the hell kind of prank causes YOU to have to do a bunch of cleanup? You think Rebekah is going to clean up that mess? I guarantee she's not. She is going for a mani/pedi, and you're paying for it.
Keep going for the video, but skip to 2:30 if you don't care about the setup.
Thanks to Captain Kronk, who agrees the best pranks usually end in house fires.