Rather a big fan of the movie Clue, but I've got strong opinions on the endings shown. Now, I understand it's meant to be truly ambiguous and, really, impossible to discern which is really the ending (the bit where it says one of them really is the real ending can be safely placed in the same category as communism, they're all equally right and wrong), but the third one, while entertaining, didn't convince me. For one thing, "Mr. Body"s motive for bringing them all there if he really is Mr. Body and not, in fact, Wadsworth, is suspect. Were he truly Mr. Body, and wishing to eliminate his spies, he would be more likely to take the option least likely to put himself at risk - not, as we see in the third ending, the one most likely to put himself at risk. Furthermore, what motive would "Mr. Body" if he really is the butler and not Mr. Body as he was shown to be in the unambiguous portions of the film, have to pretend to be Mr. Body, considering he was in a room full of people with perfect motive to kill him? No amount of money from his employer could be enough for that kind of suicide.
Also, I firmly believe that only the true blackmailer could be that much of a sleazeball. He simply didn't have the personality for a butler - not deferential in the least, not polite, certainly not formal in any way. He did, however, have the personality of someone used to pulling the strings.
I will reserve statement on whether I believe the first or second to be more likely. My goal here is simply to state that I believe the third ending to be the least probable (oh, and also to make sure my blog still works).