Let me make a small riddle of my own here.
Joe and bob are enthuastic dart players. They decide to make a bet. They wanna measure which of the 2 is a better darts player. But since they live in different places and cannot meet regularly they decide to throw the darts in a local pub. The pubkeeper will keep records. The competition would last 2 months.
When the first month is over Joe and Bob go to the pubkeeper and ask which of them has a better average on the throws for the first month. Joe is the winner with a better average.
They continue into the second month. When the month is over Joe and Bob meet at the bar again and ask which of the 2 has a better average, and is a winner for the second month. Joe again has a better average. So he's declared as the winner.
As Joe and Bob are leaving the pubkeeper stops them and says that Joe didn't win after all. When the 2 months are counted together Bob has a better average, and should be declared winner. Is this possible, or is the pubkeeper just drunk? If it is, how?
edit: misleading typo.