Unknown fossil
While at the beach, this person found a piece of rock-like material with weird, solidified tools. If you’ve seen tube worms before, that’s probably what you’d think this was. However, from the photograph alone, people weren’t exactly sure whether tube worms were involved.
Some argued that this is a piece of fossilized coral. We haven’t seen any coral with this kind of design, and we sure don’t want to! Still, it’s a pretty cool discovery. Hopefully, the OP found out the origins of this mysterious object. We’re going to guess aliens again.