'Two and a Half Men' – Ashton Kutcher, from left, creator/executive producer Chuck Lorre and Jon Cryer all appeared in what many have called a downright bizarre series finale of "Two and a Half Men." Some fans were unhappy that Charlie Sheen did not make an appearance. Shows have let down fans before. Here's a look at some of the best, and worst, finales (of course, there are spoilers).