Here are a few:
As a southpaw, I have caught myself more than once making the sign of the cross with my left hand (though this hasn’t happened recently, thank God!)
If I am not very careful, “...and the Son” still falls out of my mouth when I say the Creed at Liturgy (I noticed one other former Lutheran who stands near me in the choir smirk when this happened once – it probably horrified the others who were near enough to hear).
Seeing our sons serve as acolytes at liturgy always chokes me up a little.
I don’t like peanut butter ... or kulich (the "kulich" in our Pascha basket is always really banana bread in disguise).
I do not share the fascination common among many Orthodox Christians with with Lord of the Rings, Star Trek, Harry Potter, or other such fantasy literature or cinema.
I would like to get to a place where I am not so self-conscious about everything I say, do, think, and eat. That is to say, I would like to get to a place where the things I say, do, think, and eat are automatically the right things. Perhaps that will happen some day – but I’m fairly confident it won’t be any time soon.
I do miss singing Lutheran hymns, but not as much as I thought I would. And on the occasions when I do worship with Lutherans, I now find myself wanting to sit on my hands – and yet feeling sort of weird about even sitting at all.
I have reason to believe that several of my siblings don’t know I’m Orthodox. And I have even more reason to believe that most of those same siblings wouldn’t really care if they did know (so why confuse them?)
I keep a little tiny prayer rope in my car for use in traffic jams.
I think that several non-Orthodox Christians I know would make much better Orthodox Christians than I am.