In a certain small town, there is a barber named Bill. Since Bill is the only barber in the town, he decides that he will shave all the town's residents who do not shave themselves, but (obviously) not the ones who do.
If Bill follows this rule, will he shave himself or not?
Upon making this decision, Bill had better move out of town. Upon extricating himself from the set, he can then commute back each day and do his work on the remaining residents.
Think outside the box... (solution)
