A professionally trained actress should be a better liar, wouldn't you think? But no. I am pathetically underachieved in that area. I can think of a great lie. I'm plenty imaginative. But before the words are even out of my mouth, there's a weird tickle of unease in my armpits, a horsefly of guilt lands on the back of my neck, and before I can stop myself, that gassy little bubble of truth belches out.