Logic

Three doctors said that Bill was their brother. Bill said he had no brothers. Who was lying?

related riddles

No is to negative as yes is to...?

There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?

A town has only two barbers. One of the barbers has a nice, tidy haircut, and the other has a shaggy, messy haircut. Which barber should you go to?