Three things I've already learned from being a teaching assistant.
1. You begin to have a deep understanding of naming trends. 40% of the students in my sections are named Alex, split about 60-40 between boys and girls. The "power names" of the 80's, like Ashley, Christopher, and Kevin, are, as a grad student friend put it, "nowhere to be found". Instead I have more Kaylies, Gabbys, Dustins, and Aidens than I can keep track of, and I did not know a single person with any of those names before today.
2. You get really good at repeating yourself. I've mastered the trick of using many different phrases that mean the same thing. You must write two papers. Two papers are required. There will be two paper assignments. Por favor, dame dos papeles. Gracias.
3. You take on multiple identities. "Professor", "Hey you", and "Mrs. Teacher" all = me. I tried to explain to them that I am, in fact, not married, and not married to someone whose last name is Teacher, but they aren't having it.