Riddle: There are 15 fish in a tank. The owner leaves for the day. During the day, 5 fish drown, 4 fish die, and 2 fish swim away. The owner comes home. When he sees them, he counts them. How many fish does he count?
Answer: 15! Fish don't drown, They can't swim away because they're in a tank, and if they died, they're still IN the tank