This is impossible to solve, because if I were telling the truth, then I would be lying, which doesn't make sense since I am telling the truth. If I am lying, then what I said was true and that doesn't make sense either.
There is a certain family with both girl and boy children. Each of the boys has the same number of brothers as he has sisters. Each of the girls has twice as many brothers as she has sisters. How many boys and girls are there in this family?
In 2000, a 40-year-old doctor told his son that when a little boy he decided to be a doctor by seeing a internet web site about performing a heart transplant on a puppy with a defective heart so that the puppy would live a normal life. I then thought that I would be a doctor so that I could help people in a similar way. What is the defect in this story?
The internet did not exist when the doctor was a little boy.