Filter It Better

John was in the hospital.
He was an old man.
From time to time the young nurse came in and said in a patronising tone :
- And how are we doing this morning ?
Well, this is a story of revenge.
John had received breakfast, and pulled the juice off the tray, and put it on his stand.
He had been given a urine bottle to fill.
The juice was apple juice. You know where the juice went.
The nurse came in, picked up the urine bottle and said :
- It seems we are a little cloudy today...
At this, John snatched the bottle out of her hand, drinked its contents, saying :
- Well, I'll run it through again, maybe I can filter it better this time.