Right, I have dug up two examples of what we got up to down there...
A bored radiographer (wonder who.. :-P ) made several devices that can..uhh..explode on impact. These were originaly designed to be set off with an air-rifle but tests showed that they could be detonated with a standard 9mm pistol or thrown against a wall. Special targets for the range were made, each one having one of these impact-sensitive devices inside. Note the term 'impact sensitive' meaning that such items should not be thrown or compressed. Suffice it to say, several of us had these items as they were useful for dispersing the chav-types that were playing loud music out of their cars in the residence parking lot at all hours of the morning.
Anyway one night there we were, sitting in the casualty department with not much going on. There was one trauma surgeon, an orthopaedic surgeon, and a casualty officer. One of the guys said he was peckish and wanted a dagwood or a burger. We were all keen on that so we got into the casualty officer's car and drove around the back of the hospital to get to the highway. I was in the back with the trauma surgeon and the orthopaedic surgeon was in the front passenger seat. As we drew level with the helicopter pad the orthopaedic surgeon rolled down his window and chucked something high up into the air and then rolled it closed again. A few seconds later there was a hell of a bang right next to the car, at the back on the driver's side. The trauma surgeon almost had an instant bowel movement and the driver (who didn't know anything about these devices) was swearing and hunching his shoulders trying to correct what he thought was a blowout. Of course, I was the only one laughing, because that's how I am. The guy who threw it must have thrown it upwards and forwards, instead of vertically.
We had an agreement thereafter not to chuck them out of cars anymore...
Then there was this classic (I was not involved in any way):
There was a prefabricated building at the rear helipad where the pilots would sleep if the weather was bad or if they were on shift but it was quiet. One of the pilots had taken a casualty doctor up in the heli a few days previously and thrown the machine around the sky so that the doc was almost puking. (They were always trying to get each other, just a bunch of lads, you know.)
One night that very same pilot was peacefully sleeping in the prefab building at the back of the hospital. The victim of the flying stunt, a guy called Simon, got a heavy-duty biohazard bag (they throw amputated limbs in there before they are incinerated) and siphoned two cups of petrol out of one of the nurse's cars. He poured the petrol into the bag and then filled it up with gas from an oxyacetylene cylinder. He then shook the bag nicely, getting the petrol all over the inside of the bag, tied the neck off like a balloon and took it down to the prefab hut where the pilot was sleeping. He put it outside the door and wound a length of toilet paper all the way from the bag to around the corner, and lit it.
Now this was a bag which when inflated was about the size of a PC monitor box. I don't think the casualty doc understood how much gas is fun, and how much is daangerous, because it was too much. The bag detonated and blew out all the windows of the prefab and pushed the door off its hinges at the bottom. The explosion woke up everybody in the last block of the hospital and the police were dispatched (which is pretty impressive because in South Africa they don't come out for trivial matters). The pilot was deaf in one ear for three days and had only a ringing sensation in the other. He was not fit to fly any more of his shifts, although his constipation was cured.
The two chaps agreed to a truce soon after.
