奇妙 is different from 奇数 奇数　means odd numbers. 奇妙(kimyou)　means strange or unusual. but if you look it up in a dictionary, you'll find many meaning, such as bizarre, odd.. Although all of them seems to be similar. In short, the tales of strange world.

Andrea-san, I enjoyed watching ｢世にも奇妙な物語｣ TV series as a child. It was extremely popular in early 1990s. Then they made movie, TV special etc., too. For me, it's kinda impressive that foreigners "excavate" such an old program and enjoys it. hehe:) It's true that some episodes of 世にも奇妙な物語 are difficult to understand even for Japanese. Also, you have to note that there is no "right" answer when you interpret stories. In my best interpretation, the title 奇数 means something is going "odd" about numbers in this episode. There are mainly two reasons that makes the leading character (and the audience) feel scared. - There is some strict rule in the bus. Everyone but him knows it and is following it. The rule must be executed no matter what. -What will happen to him, who broke the rule and left alone in the bus without driver? (The outcome is left for your imagination. ) That's my best answer. Hope someone might bring up some different interpretation^^

Yes. There is a whole bunch of stories referred to as 奇妙な stories.