By Unknown
Well, New Zealand comes close, at least, but Canada is still clearly in the lead!
Honestly, I'm surprised there wasn't an EMT onsite for this masterful, albeit horrific prank. The lines between 'good fun' and 'reasonable' were blurred, to say the very least; but there's no denying the fact that this is straight up gold in terms of quality pranking.
This multi-layered, three-dimensional domino setup took two weeks to build and only a matter of seconds to come crashing down in spectacular fashion.