What’s a small, harmless superstition or belief that you have?

IMO there are no harmless ones (by that I mean dictionary definition superstitions - not just things like traditions and adages that have a logical reason or basis), if a person truly believes in actual magical thinking no matter how silly it's a doorway to accepting the rest.

Like letting in bullshit like horoscopes, homeopathy, faith healing, yearning for eschatological prophecies...