Got a kick out of this gem from the reddit comments: > My S2000 car alarm would be set off whenever I microwaved blueberries. Some experimentation revealed it was anything with excess water. Buying a new microwave solved the issue but I don't like thinking about how poorly shielded the old microwave was. I tried moving the for further from the kitchen or keeping the keys far away to no avail.
As for the S2000, I guess water coincidentally changes the frequency of the leaked radio waves to match the car alarm?