Creature of Habit

I've been living in my apartment for 12 years. You would think by now I would know where the lightswitch is in my kitchen. The thing is - in the house I grew up in the lightswitch was on the left, as it was in my past 2 apartments. In my current abode, it is on the right. It never fails.... I always try to turn on the light from the left. Pavlovian..... or just stupid? Sometimes I wonder.