Rhino was a fun JS system. One of the continuation examples I did for a talk was migrating threads in Rhino: https://bluishcoder.co.nz/2006/06/11/migrating-javascript-th.... Start a thread on one machine, serialize the continuation and send it across the network and resume it on that machine.
As a proof-of-concept, it was fun, but that's as far as it went :-)