Shot Glass Test

Charlie spent his Friday night out at the local pub. Jones, the bartender and owner of the pub offered him another beer, when Charlie just asked, 'Jones, you like betting, don't you? I bet you £1000 that I can piss into a shot glass at the end of your pub without spilling a drop.'
Jones thought to himself, 'This guy is an idiot, I will win his money.'
So Jones walked down to the other end of the pub, and put down the shot glass. He walked back behind Charlie, 'Let's start!' he shouted.
Charlie unzipped himself, and started to piss all over the whole place. Jones roared with laughter. After, he noticed that Charlie was smiling. 'What on earth are you smiling at, you just lost £1000.'
'Well Jones, can you see that man writing out a check?'
'Yeah, what about him?'
'Actually, I just bet him £5000 that I could piss all over your bar and not only wouldn't you be mad, you would laugh crazily about it.'