The annual Cystic Fibrosis fundraising event that Rob Olson holds at his Lake Elmo, Minn., home tends to rake in big bucks. But this year, it'll score nothing: Olson (pictured above) had to cancel the fete because he accidentally killed his entire lawn, a TV station reported.

Olson, who founded a fundraiser for the Cystic Fibrosis Foundation, was simply using a weed killer to spruce up his lot before the charity event. But shortly after spraying the product on his lawn, it began to die -- all 40,000 square feet of it.