**Riddle**: You walk in a room and on the bed, there are 2 dogs, 4 cats, one giraffe, 5 cows and a duck, 3 chickens flying above a chair; how many legs are on the floor?

**Answer: **There are a total of 6 legs on the floor. But how?

How cannot this 6. Firstly you enter the room, you have 2 legs. You see animals laying on a bed. A bed has 4 legs. You see chickens flying above a chair. A chair has 4 legs. In summary 2+4+4 = 10 legs.