Man goes into a pub and says to the landlord, "Quick, give me a double whisky before the trouble starts!"
The landlord serves him up his whisky and the man downs it quickly.
"Quick, another double before the trouble starts!"
Landlord again obliges and the man drinks it. The man does it a third time. After the customer downs the third double whisky, the landlord asks,
"What's this trouble then?"
"I haven't got any money to pay for the drinks" replies the man.