I've had a couple of people that I've know for years simply look through me. I saw a barber who used to cut my hair every six weeks simply look past me as I sat in his shop when he walked in. He knew I was coming to have my hair cut but I'd not seen him for about a year.I wouldn't recognise you, Good on ya.
Last weekend I was chatting with one friend when another one walked up. I've known Bill for about twenty years but haven't seen him for a couple of years. He just looked through me and said hello to the other guy without realising it was me.