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.
More: https://www.kickstarter.com/projects...an-perforator/
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