In the middle of the night, middle of nowhere, two cars both slightly cross over the white line in the centre of the road. They collide and a fair amount of damage is done, although neither driver is hurt. It's impossible to assess blame for the accident on either however.
They both get out. One is a doctor, one is a lawyer. The lawyer calls the police on his car phone, they'll be there in 20 minutes.
It's cold and damp, and both men are shaken up. The lawyer offers the doctor a drink of brandy from his hip flask, the doctor accepts, drinks and hands it back to the lawyer, who puts it away.
"Aren't you going to have a drink as well ?" the doctor says.
"Later. AFTER the police get here," replies the lawyer.