Never occured to me but i think i am a creature of habits. Some small small things i don't really like to change or unintentionally i don't want to change.
When i was staying at a hotel while in SFO, a colleague of mine used to join me for breakfast everyday and noticed that i always use to take the same table in the room. I am not sure why but it just sort of turned into a habit and i never noticed it until someone pointed me that. So after that incident i seem to notice a lot of small routines that has turned into habits over short period of time. It seems strange and i happen to notice it more, especially after somebody pointed that out to me :)