This test was given at the German Institute of Logical Thinking in Berlin
in 1981 and 98% failed.
> > 
> > There are 5 houses in a row.
> > All houses have their own unique colour.
> > All the house owners are of different nationalities.
> > They have all different pets.
> > They all drink different drinks.
> > They all smoke different cigarettes.
> > 
> > The ENGLISHMAN lives in the RED house.
> > The SUEDE has a DOG.
> > The DANE drinks TEA.
> > The GREEN house is on the left side of the WHITE house.
> > In the GREEN house they drink COFFEE.
> > The man who smokes PALL MALL has BIRDS.
> > In the YELLOW house, they smoke DUNHILL.
> > In the MIDDLE house, they drink MILK.
> > The NORWEGIAN lives in the FIRST house.
> > The man who smokes BLEND lives in the house NEXT to the house with
> > CATS.
> > In the house NEXT to the house where they have HORSES, they smoke
> > DUNHILL.
> > The man who smokes BLUE MASTER drinks BEER.
> > The GERMAN smokes PRINCE.
> > The NORWEGIAN lives next to the BLUE house.
> > This man drinks WATER in the house that lays next to the house where
> > they
> > smoke BLEND.
> > 
> > Question: now, who owns the ZEBRA???