Have you ever seen it?
James Callender, a resident of Cambridge Springs, Pennsylvania, found a lawn bubble in his backyard after a heavy rain. There was no other reason for the blister to form: no leaking septic, no broken water line. Nothing. The blister was larger than a waterbed, and a lot wavier.
A massive lawn bubble formed on the 14th fairway of the Greywolf Golf Course in Invermere, British Columbia after a break in the irrigation system.