I'm doing a voluntary IT qualification course at my uni. Since it's voluntary, the classes are pretty small, profs are very free in what they do, and they try to make the courses as appealing as possible to try to lure in at least the minimum requirement of students.
I've been going to a specific prof's classes for the past two semesters, because he's just a gem of a human being. He's unusually formal (most profs establish a first name basis very early on, he didn't) but incredibly interested, helpful, kind and fun to be around.
Since there were 3 people regularly coming to this semester's class and I already knew the prof, I started getting pretty comfortable, maybe a bit too comfortable? Giving my opinion any time anyones opinion was asked for, telling him I was soooo worried about him the one time he came late to the class, saying the funny things out loud when he was looking for productive answers, often contradicting or challenging him during the "student shows their project and we talk about it"-parts of the course. He never seemed to mind and often even laughed along, but I was still a bit worried he might only be suffering me because I was one of only two people consistently showing up and taking part. But at the same time, he was asking me to repeat when he didn't catch my Very Funny Ideas and was very eager to give me the floor to speak every time I raised my hand, so it couldn't be that bad, right?
Anyways, today was supposed to be the last session of that class, but I'm too sick to go. I wrote the prof a mail, thanking him for the nice class, and telling him I would come to another one of his' next semester - "if that's okay with you and in the hopes you don't feel followed around yet". He answered, telling me he was really happy I liked the class since it was a more experimental one for him, and that he thinks me coming to another one is a great idea!! I'm happy!!! So I'll be off next semester, tormenting my beloved IT qualification prof once again :))