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Interesting phenomenon I hadn't heard of before today. It looks like someone else thought to cross-post this from Reddit!

https://www.reddit.com/r/Weird/comments/1lwj0qy/weird_holes_...

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Lasagne batteries hit the front page of reddit every couple of months. That's where I learned about galvanic corrosion in general a couple of years ago.

I know tomato (acidic) will make holes in aluminum foil but I didn't know more than that.

I guess today's my day: https://xkcd.com/1053/

On a related note and a slightly larger scale:

https://en.m.wikipedia.org/wiki/Galvanic_anode

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