We nurses had a great way to get back at difficult male patients. Not on the ones who are actually sick you understand - just the ones in for some minor problem. A sense of humour, on their part, helped too.

1. Place 1 effervescent tablet and a little Mercurochrome in an empty urinal.
2. Present it with a friendly smile to the difficult male.
3. Hide outside the door and wait for the screams.

You could use Gentian Violet but red colouring is more interesting.

Cheers, safely pensioned off, Joy