In 1969, the Army Corps of Engineers bet some drunk dude in a bar that they could stop Niagara Falls. The dude said, “Yeah right, Army Corps of Engineers, that’s impossible…if you can do that, I’ll buy you a beer”. The Army Corps of Engineers REALLY loved beer, so they hiked to upstate New York, worked their magic, and literally stopped the flow of water to the amazement of hundreds of cheering Honeymooning tourists.
OK, i lied. They actually did it to check for structural integrity and to clean up the area…also, no one really cheered them on. (My version of events is more interesting).
Here are a few photos of the Falls sans water:


And just in case you forgot the INSANE amount of water that usually flows in Niagara Falls:

-Link via Presurfer