and just having a conversation about something mundane like how you have to work at the weekend and then mid-conversation pointing at the mirror and laughing going "He makes me laugh him" and looking at the other person with a big grin on your face. When they respond "who?" you just point at yourself in the mirror and go "him" as though you've spent your life unaware of the fact that that is your reflection and you think it's another person. Big grin remaining on your face as the other person stares at you confused.