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xkcd #2944: Magnet Fishing
(imgs.xkcd.com)
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The ten-way tie was judged a ten-way tie, so no one won the grand prize, a rare fishing monopole.
I remember watching a video where some people pulled a landmine out of a river and the cops were so annoyed to have to deal with it. Apparently this wasn't the first explosive that's come up out of that river and the cops basically blamed the people for pulling out another one.