I don't know if this is an INFJ thing or if I'm just weird.
When I meet someone new I automatically try to categorize and group the person with other people I've known in life. Sometimes their personality type and physical look will remind me so much of someone else. I know they are a unique person, but in my mind I keep 'seeing' or 'hearing' the other person. For instance, one of my co-workers is a blend of three other people: my dad, an aquaintance, and an ex-boyfriend.