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Had one in my garden as well last month! Here we call them “Witch’s butter” [0]. It was there for some days and seemed to move a bit over those days but then crumbled indeed.

[0] https://nl.m.wikipedia.org/wiki/Heksenboter

There's a rare ascomycete fungus, Nectrioposis violacea, that parasitises Fuligo septica and turns it from yellow to blue in color. There seem to be various color morphs, one I found was a really spectacular deep violet-blue. The ecology of these specialized fungal parasites whose hosts are themselves rare or very patchily distributed really fascinates me.

This is literally my favouriate living thing beyond my immediate family. Even the names are amazing: dog vomit slimemould. I mean COME ON.

Scientists are usually pretty tongue in cheek when naming things, but slime mold scientists are especially plain. I love it.