I actually have had this at one point... it always scared me until I realized I have some degree of OCD with my anxiety. But at the time it was always freaking me out since I felt really insane for doing it. I had an obsession with not choosing the number 4 for some reason, since at one point a fortune teller told me that it means death in Eastern astrology/numerology, so 4 became abnormally 'bad' to me, and if it came up excessively in phone numbers, or say if I had to have an appointment on that date, I'd feel worried. I don't think about numbers excessively but these weird connotations were extremely hard for me to shake and still are to this day.