as quoted from
http://puzzles.about.com/library/weekly/bleins tein_riddle.htm Supposedly, this riddle was created by Albert Einstein and, on average, only 2% of solvers will be successful.
Five people of different nationality live in a row of five houses of different colour. Each person prefers a different beverage, smokes a different brand of cigar and keeps a different kind of animal.
1. The Brit lives in the Red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The Green house is on the left of the White house.
5. The owner of the Green house drinks coffee.
6. The person who smokes Pall Mall rears birds.
7. The owner of the Yellow house smokes Dunhill.
8. The man living in the centre house drinks milk.
9. The Norwegian lives in the first house.
10. The man who smokes Blends lives next to the man who keeps cats.
11. The man who keeps horses lives next to the man who smokes Dunhill.
12. The man who smokes Blue Master drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the Blue house.
15. The man who smokes Blends has a neighbour who drinks water.
Who owns the fish?
Note: google this and you will find the exact same riddle posted from numerous sources. rather than look up the answer, try solving it first. Have fun.