Taking ages to make one OHP transparency pre-Powerpoint days.
Seeing some god-awfully-tedious Provost Officer dump about 80 OHP slides on the right hand side of his talking torso and watch him gradually move them over to the left hand side during the 2 hours it took him to lecture us about RAF Security during IOT.
I still have nightmares. We had enjoyed the NAAFI wine tasting night the evening before and people were desperate to throw up or pee but there was no escape!