Lawyers for Jerry Seinfeld insist the comic was just joking when he described "Sneaky Chef" author Missy Chase Lapine as a "wacko" for accusing his wife of plagiarism. Lapine is currently suing for trademark infringement because she says Jessica Seinfeld’s hit book about sneaking healthy food into kids’ snacks, called "Deceptively Simple," contains too many similarities to "Sneaky Chef" – and it was published by HarperCollins, who twice rejected Lapine’s pitch. While appearing on Letterman’s......