Paint can perforator Kickstarter
Paint Can Perforator by Dereck Eckels. Failed on Kickstarter with $110 pledged of $20,000 goal.
Painting gadgets are susceptible to gimmickiness, but I like this one. You hammer the tool down onto a can of paint, like banging down a lid, and then you pry it off. It leaves holes in the channels of the rim.
https://diqn32j8nouaz.cloudfront.net...erforator1.png
https://diqn32j8nouaz.cloudfront.net...erforator2.png
More: https://www.kickstarter.com/projects...an-perforator/