[Symmetry]

But still not perfectly safe. I'm not sure how much power a F-16 puts out but when I was working on space surveilance radars we were very careful not to be pointing our beam where people might be.

https://en.wikipedia.org/wiki/Microwave_burn

[chiph]

A roommate's girlfriend worked on PAVE PAWS. They were very careful where they steered the beam. Rumor was the one on the east coast cooked some fish when they pointed it into the ocean.

[mikeash]

And of course the microwave oven was conceived when a guy walked in front of an operating radar and it melted the chocolate bar in his pocket. It gave him a genius idea!

The best part about this story is that if you tell people who don't know about it, they'll think you're full of shit. But it's absolutely true.