I've made maps for a living for ten years now, and I only just realized the source of my coordinate dyslexia.
Image Source: Wikipedia
In cartography most locations are plotted by latitude and longitude. Points are given as 43.45º North, 114.77º West or 43.45º,-114.77º.
Only this morning, writing X,Y in my code and watching it map off the surface of the earth that I realized the latitude and longitude are presented as Y,X. I have no idea how it took me ten years to realize why I was always getting that backward.
Here I thought it was just my numeric dyslexia.