Here's a good one. Marcus has four friends who he is upset with. "Hey! One of you ate my piece of cake! I was saving that for later!" he says. His friends respond:
Jim: "I didn't eat it!"
Sue: "Neither Jim nor Patricia ate it."
Orville: "I didn't eat it, either!"
Patricia: "Orville is telling the truth."
Somebody isn't telling the truth. That person is the cake gobbler. Who is it?
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[quote]Somebody isn't telling the truth. That person is the cake gobbler. Who is it?[/quote]Given: Liar = Cake eater, there is only one liar.[quote][/quote] If Jim ate the cake, then both Jim and Sue would be lying. If Sue ate the cake, then Sue would automatically be lying about both Jim and Patricia, who would in turn also be lying. If Orville ate the cake, then both Orville and Patricia would be lying. If Patricia ate the cake, then Sue would be lying. If Marcus ate the cake, then he would not be lying as he stated "Somebody ate my piece of cake!" and never denied it was himself. Therefore, OP is the liar.