Two men are out riding on their motorbikes in the African bush when one of them takes a tumble and falls into the scrub, in which a black mamba is hiding.
As the rider starts to get up, the black mamba, most annoyed, bites him on his willy.
The rider yells out in horror and tells his friend what has happened and pleads for his help.
His friend gets out his mobile phone and rings the local hospital to speak to a doctor to enquire as to what he should do.
"That`s easy", says the doctor, "All you need to do is to suck out the poison, but you need to do it soon or it will be fatal".
"Thank you", says the friend and closes the connection.
The bitten rider looks up at him and says "O.K. then. What did the doctor say?"
"You`re going to die".