This isn’t really Niagara Falls related, but many people who do come to the Falls also check out the canal, so I guess there is a bit of a tie-in.
On August 11, 2001 (just over 7 years ago), a boat crashed into one of the bridges that crosses the canal (in Allanburg). I have no idea who made this video (how on earth can you be in the right place at the right time for something like this?!), but I link to it for your viewing.