There were these three guys at the lake, a German, an Englishman and a Nigerian. The German took out his dick, put it in the water, waited a while and told the others: "I can feel the temperature of the water. It's 32 degrees Celsius".
The other two were amazed. "Let me try", the Englishman said. So he put his organ in the water, waited and said: "To be more exact, the temperature is 32.3 degrees Celsius".
At last the Nigerian man said, "Let me have a try". So he took his equipment, lowered it into the lake and said: "I've no idea about the temperature, but the water is 2 feet 9 inches deep".