My dad told me a few times when he was in the navy (he switched to army after the Korean war), he had to give vaccinations. People would be lining up waiting. A few times he took a huge syringe, filled it with acetone, put the longest needle in it, and then lit it on fire. Walking into the waiting room, squirtting the now flame thrower saying "who's next?" more than once somebody fainted.
Bari Jo