Probably for me it was just after I got my new LX200 (1999) and we had a public viewing night at the oblisk in Newcastle. I set up and thought I had everything working well before sunset, then turned everything off. 30 minutes later, the sun had just set, several eager people had lined up behind my 12" LX200 goto buzz click whirr machine, I turned it on and not knowing exactly what happened the motherboard failed on bootup (& that is a completely other story Eh Mick P!

). i tried several times and in the end i manually slewed it around the whole night, to have a child say," Hey Mister, has your battery gone flat? hey mummy lets go to that other scope it makes a noise, this one doesn't so its broken."
I bit hard to impress the young EH.