Changing your routine; paranoia or common sense?

My car won’t start
Well, maybe there’s a killer after you!
Mitch Hedberg

I always look in the backseat before I unlock my car. I leave at different times of day and take different routes. Partly, because I get bored but a lot of it has to do with growing up with horror films and true crime tv. “The perp had obviously studied her routine.”

So don’t have a routine.

Anybody else think this way?