We were talking about this yesterday in my astronomy department and one of the professors here told a similar story about some radio interference at the Green B

We were talking about this yesterday in my astronomy department and one of the professors here told a similar story about some radio interference at the Green Bank telescope. The astronomers there had noticed that for some time there had been a small burst of radio interference every day right around 5pm, plus or minus about 5 minutes. One of the employees at the observatory is a guy who drives around and talks to the locals to try to track down any sources of interference that the telescope is detecting. He went around asking people if they were using their microwaves, cell phones, wifi, etc., and none of them were. He eventually went to one lady's house and happened to be there right around 5pm. He was asking the usual questions and she said she hadn't been using her microwave, etc., but then she said, "Oh, could you hold on a moment? I have to feed my cat." And then she put a can of cat food in an automatic can opener. That turned out to be the source of the interference. I just heard this story second-hand, so I can't vouch for the accuracy of all the details, but it seems plausible enough to me.