I'm not very superstitious, but some do cross my mind occasionally. For example, at the grocery store I somehow always end up in the cashier line 13. I don't avoid it, but it is curious. Maybe many others avoid it so I go there since the line is always shorter.

One mildly compulsive thing I always do is to make sure the three pill boxes are upright and showing the days the right way in the larger box I store them in. Sometimes my husband puts his the wrong way. When I discover this, it really bothers me and I correct it. Deep down I know nothing bad will happen because of that, but I still don't like it.