I taught one of the DT technology subjects. All related but different. Quite a few to choose from. Similar exam numbers though.
I was always very very careful to get the correct exam number. One electronics exam course was very theoretical/mathematical. (We didn't do that one) the other was fare more practical based.
Fortunately we never got that wrong. Pupils would have struggled with q1 onwards.
All our subjects were practical and so we had moderators come in to check our marking. We knew some regulars and some did several tech subjects.
So the letter came in and we read it as a colleagues subject. He got all his projects out, neatened them up, labelled them.
Chap came in..... I've come to see electronics.
I was supposed to teach all afternoon. Projects all over the place, some at home - small ones were easier to take home to mark. Some had flat batteries in them etc etc. We always presented projects in the best light.
Fortunately he understood, my marking stood.
.........................................
Open evening. 5.00 pm Last minute jobs, setting out rooms. I'd put some things to cut on laser cutter and left to get a sandwich as it would be my last chance to eat until after 9.
Came back to find laser cutter had caught fire, fire engine had just left, smell of smoke. Laser cutter (£10,000) ruined.
The Head was very understanding. Said it could have happened to him - it'd have been p45 time with one I worked with.
I think insurance paid for another one.