Whites are washed on a 60deg wash, as are towels and bedding. Everything else goes on a 30deg wash.
Socks are hung in pairs, by the toe. If the first sock is pegged with the heel pointing to the right, then every sock thereafter must point the same way.
Sweaters and t-shirts are hung over the line, so that the pegs can be placed in the armpits, to avoid peg marks in a more visible place on the garment.
Towels are folded in a particular way, as are tea towels (although they have a different folding pattern
)
The dishwasher must be loaded in a particular way, and is frequently re-arranged after DH has put something in it in the 'wrong' place.
The loo roll should feed from above, not below - there is actually a kind of logic here: if the holder is on a painted wall, having the paper feed from above avoids grubby little hands touching the wall. It was a habit I got into when the children were little, and it's stuck!
Shopping is placed on the checkout belt in the order which best suits packing. That is to say, tins, bottles, cartons, cereal packets etc go on first, and soft fruit and veg, and eggs, go on last, with everything else somewhere in between.
Thing is, in general I'm one of the untidiest people going, with no organisational skills whatever. I can't understand how I've developed such pernickety ways 
