A course was short-staffed after a large influx of students wanting to take the class. They reached out through their current TF's and I was contacted since I had graduated and was in the area. I was brought in immediately with little prior communication. The world of academia is simply a far more casual place than other sectors. After meeting with the head of the course, she asked me several questions, but mostly about my commitments during the semester (of which I had none). Shortly after she let me know she'd love to have me aboard.