An Arab was admitted in the Dar es salaam Hospital for a heart operation, but prior to the surgery the doctors needed to store his blood in case need arises. As the gentleman had a rare type of blood, it couldn't be found locally. So the call went out to the neighboring towns. Finally a chagga was located who had a similar type of blood. The chagga willingly donated his blood for the Arab. After the surgery,the Arab sent the chagga as appreciation for giving his blood, a new BMW 540iL, diamonds,jewelry, and half a million US dollars. Once again the Arab had to go through a corrective surgery. His doctor telephoned the chagga who was more than happy to donate his blood again. After the second surgery, the Arab sent the chagga a thank you card and a box of almond chocolate & sweets. The chagga was shocked to see that the Arab this time did not reciprocate the chagga 's kind gesture as he had anticipated.. He phoned the Arab and told him, 'I thought this time u would give me Toyota Prado, Diamonds and Jewelry. But u gave only a card and a box of almond chocolate & sweets. To this the Arab replied 'Can't help it, friend..... Now I have a chagga blood in my veins!!