Considering the caveats that the author includes, my curios-but-not-really-useful prize goes to Quantum::Entanglement and Quantum::Superpositions.
I really like Quantum::Entanglement, and have had great fun with it in some spare time projects, but as far as I can understand, these modules are so complex that they should not really be trusted for production code. I have been told as much on other occasions, at least, and the Bugs section in the Quantum::Superpositions POD is not very assuring ...
There are undoubtedly serious bugs lurking somewhere in code this funky :-) Bug reports and other feedback are most welcome.
But any! And all!
Mischief. Mayhem. Soap.