(I heard the British actor Peter Ustinov tell this one on T.V. after he had
been on a visit to the Soviet Union)

One Russian and one Polish workman were digging the foundations for a new
road. After several hours of hard toil, the Polish guy hits his shovel on
something hard in the ground. Both men work hurriedly to dig the object out
and discover that its a treasure chest. On opening it they find jewels,
coins, gold etc. beyond their wildest dreams. Both are wild with happiness
and dance around madly. When they have calmed down, the Russian takes the
Polish workmans hand and earnestly says, Sir, we will share this just like
Russian – Polish comrades should, and the Polish guy says, Oh no, 50–50.