I've got a couple the same as other pp's.... I cut my sausages lengthways to ensure they are cooked thoroughly and I eat the crusts first unless it's crusty bread or toast then they come last.
I hate even numbers, especially anything divisible by 6 and use 'and' when counting instead (1 2 3 4 5 and 7 8 9 10 11 and 13 etc), unless it's 30,60 etc because they're 10's and the only even numbers properly allowed in my world.
I use family birthdays when choosing numbers for things, fortunately they are all odd too.
The tv/radio volume must conform in the first instance with a birthday or at least be an odd number.
I count each step when going up/down stairs and at home it goes .. 1 2 3 4 5 and 7 8 9 10 11 and I'm at the top/bottom again ('and' is 12 clearly, 'I'm at' is 13, 'the top/bottom' is my right foot hitting the floor at the top or bottom and 'again' is my left foot meeting it there, thus completing the stairs journey). This started one night when the landing light bulb had blown and I had to go up to bed in the dark and it's stuck with me ever since.
I'm also lefthanded so my left hand/foot always has to be first, I couldn't bear the thought of my left being anything other than an odd number!
Clearly, I'm odd (thank heavens for that), but I just don't care ?