It isn't easy going to jail for being a practical joker. Of course, this particular joke left 20 cars wrecked on the highway and two politicians' careers in tatters - so jail is where Harold K?nt landed. Now he's just trying to keep a low profile in the Big House. He wants no part of his fellow inmates' plan to use an escape tunnel to rob two banks. But it's too late: he's in it up to his neck. And that neck may just wind up in a nooseà