Tube bosses have launched an investigation after a vasectomy delayed thousands of passengers.
Thousands of passengers faced delays
A trainee driver fainted as two colleagues discussed the particularly grisly details of the operation one of them had undergone.
The trainee was taken to hospital and treated for head and chest injuries after falling from the cab.
At the time, London Underground blamed the delays on a defective train, according to the Evening Standard.
The trainee, just one week into his practical instruction, is thought to have been sick after his instructor and a driver, both older men, ignored his request for a less intimate topic of conversation, the newspaper said.
The train was travelling at about 15 mph (24 km/h), having just left Aldgate.
The Hammersmith and City and Circle lines were brought to a standstill, the Standard said.