Treachery and Betrayal at Jolly Days — Dan Greenburg

When last we saw them, the Shluffmuffin twins were running for their lives. In this, the second installment, they run right into the arms of their long-lost father. But he's not quite as they remember him . . . Of course, who would be after a tragic Porta Potti accident? Instead, he has become something frightening, something far too horrifying to explain.

No, no, we can't do it, you'll just have to buck up and read the book yourself. When things get creepy, you try to cover your eyes, but you peek through anyway, don't you? Well, then, you'll get what you deserve--a laugh attack you'll never recover from. Serves you right.