Because I have way older siblings, I always kind of had in mind what kind of shenanigans people that age were always up to. Actually, one of my english teachers opened for my brothers' band back in the day when I was still in high school. I also had some other teachers that were pretty open about having lives outside of school--nothing inappropriate, but open enough.
There are times though where I am still surprised at myself, at this age, at my budding profession. And you'd be surprised, gentle soul, at how comprised and professional I am as a teacher!