Sperm Donation

A couple of guys with low intelligence, wanted to earn some money as they were always broke. They decided to earn some money by supplying sperm to a donor bank. They booked the appointment and underwent a physical from their doctors.
The day of the appointment at the bank came around and they made their separate ways to the bank. Well it turned out to be a complete disaster, one of the men missed the tube and the other came on the bus.