So probably the weirdest Cambrian creature was this little beast. It's called Opabinia.
About the size of a mouse, and probably a relative of anomalocaris. Opabinia is mostly unlike any other creature we've ever found on Earth. Five eyes and an odd little trunk with a grabby thing on the end. In an incredibly bizarre form of convergent evolution, it probably used this appendage to eat in much the same way an elephant uses its trunk!