Ok so I’m making lunch, poached eggs on toast. I’m hopeless at making them in a pan so have a poacher insert with plastic cups.
Everything is going well, toast is on, tea is brewing. Eggs all ready to go bar putting water into the pan. Next door’s cat suddenly comes into the house so I shut the door and shoo her out (I have 3 cats and they aren’t keen on her). Put the pan on. Then I start to smell burnt plastic. Yep I’d forgotten to put the water in! 
Pan is ruined and I’ve just had to have cheese on toast instead. New pans are about £17 for a cheap one so not a inexpensive mistake
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Cheer me up MN and tell me about your domestic disasters.