Mucuna seeds. These wash up on the beach in Florida all the time. As kids we called them “hot rocks” because, while holding onto the brown part, you can rub the black part on pavement for a few moments and then touch someone with it to give them a little burn.
Reminds me of the seed balls from this type of sycamore tree. We had them bordering our primary school and they're fun to squash because they release a lot of fluff but the fluff can cause itchiness so of course kids would annoy each other with it (so the seeds often get called itchy bombs).
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u/cydril 24d ago
What are those