I was once presented with such a contract; After returning them a redacted version of the contract with all the offending clauses and pointing out that it was b

I was once presented with such a contract; After returning them a redacted version of the contract with all the offending clauses and pointing out that it was both abusive and unenforceable (as I was working from a country where these clauses, while not completely uncommon, aren't legal), they still insisted. I did them a counter-offer; I calculated how much money it would cost them to own everything I would produce or think of during the contract, and even told them I would carry a recorder to record every dumb idea, plus a bag to collect all the poop, so they could have all their precious IP. It was a fun discussion.