Nothing major, just a series of petty annoyances.
The car didn't charge properly last night, I always check that the light has gone blue when I plug it in but when I came out this morning it only had 10km on it. It's a PHEV so I could still use the petrol engine, but I much prefer the electric.
I made DD bacon for breakfast, only for her to announce that she doesn't like maple-cured anymore. There was nothing else so she ate it anyway but whinged the whole time.
I had to drop DD early for basketball training (usually she gets a lift from a neighbour) and there were roadworks.
I told DS to be ready to leave as soon as I got back from DD's school run because I had to go to a GP appointment immediately after dropping him and traffic can be unpredictable. He wasn't ready. There was shouting.
I came back and put a wash on. I just went to take it out of the washing machine and I had loaded the Colour Catcher and the laundry powder but NOT the clothes. 
I went to put the final boarders onto a quilt that I'm making for a friend. The boarder fabric is navy and has somehow managed to get entirely covered in pale fluff and threads so I've had to de-fluff a huge amount of fabric with a tiny lint roller. It took ages.
It's only lunchtime, there's a whole afternoon of opportunity for things to go wrong.