Yeah, you have my sympathies.
I was the only tech in my company in the new products line. Showing up at a tech training meeting for paying customers was a command performance. In the middle of my first presentation, someone asked a question that only a tech drawing could answer. I was using an overhead projector shining on one of those old pulldown movie screens. I had no blank transparencies to scribble on, so I simple grabbed a magic marker and started writing on the screen... no, wait, is this a good idea?! It got some good laughs, and the hotel who owned the room and the screen sent one of their techs up to clean the screen right away. After that, I knew to have blank transparencies at these things.
Ah, yes, all nighters. That ended at my last job after it was discovered that I had a sleep impairment and had to be wearing a mask attached to a machine when I slept. No more rolling under a desk on a sleeping bag for a cat nap. It got to midnight and I was out of there.
Take care.
kenjj