Maybe the Joba Rules should have indicated no trampoline jumping.While Joba Chamberlain was recovering from Tommy John Surgery, he decided yesterday to hop on a trampoline with his son. Unfortunately for Joba, he dislocated his ankle and went under the knife, Jack Curry tweeted. Now Brian Cashman doesn't know if he'll ever pitch again.It was irresponsible for Joba to participate in such acts with his son, and now he likely will never pitch again in pinstripes -- or maybe not for any team.Cashman on if the injury was career-threatening: "I'd'like to say no. My heart and my gut tell me no."I felt bad for Joba before this. He brought so much excitement to the Bronx when he first came up in August 2007. Then the Yankees tried him as a starter -- that backfired. Then they let him try to be a...

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