It's the diaper that boldly goes where no incontinence product has gone before. The sordid saga of a love-struck, diaper-clad astronaut has transformed a somewhat obscure NASA undergarment into a cultural phenomenon. Comedians and bloggers can't get enough of the topic. "We will not be stopping for commercials tonight ... because I am wearing a diaper," Jay Leno joked Thursday. And David Letterman told his audience that when police nabbed astronaut Lisa Nowak in Florida, "she was wearing a wig and an adult diaper - and there was a lot of confusion because authorities originally thought she was Elton John."