Spraying hand foam on people...water fights with syringes...those sound familiar!
I've also heard of Lasix in the coffee, and NTG paste under door handles, though haven't actually seen either of those happen!
My coworkers got me really good on my first ER night shift...I'd had about 3 pts die on me that night, and one of pt's families had been a little indecisive about coming in to see her. I finally had to take her down to the morgue...one of the nurses pretended to be a family member, called me in the ER, and wanted to know "WHAT DID YOU DO WITH MY BABY! I'M COMING IN! OH DEAR LORD, WHAT HAVE YOU DONE!!!!! BRING HER BACK!!!!!!"
And there are people in the background yelling and carrying on during all this...hehehe...
I totally fell for it, so luckily they couldn't keep quiet for long!!!!