Used to work in a bar with a guy who was known for being adventurous with his drug taking, I found one of those spare button bags on the bar with a designer label on it binned the button an put a decent amount of salt in it and sealed it back up.
Saw the drug guy heading into the glasswash so I went over too:
"Oi Steve, you seen this designer KET?"
he made a line and snorted it, His face went red his nose started to run and his eyes watered as I laughed maniacally. Good times.
Also worked in Oceana for about a year. I was on duty for a Vodbull event where a girl passed out blackout drunk as she was on the loo, went in with a female door supervisor and we had to forced the cubicle door. The door swings open and we are presented with the sight of the young student on the floor with a log hanging off the seat trailing her.