Well, not best experience per se, but most memorable one.

So I am accepted to CS program at the university - happy days!

First lecture of the first day of the first semester in the first year...

...It just had to be that guy. He was famous for for his strictness among the faculty as we later found out.

But, the lecture. It's 8.25 am, I am making my way into auditorium, and it's filled with freshmen like me, of course. Instead of cheerful chatter noise I hear literally silence. What the? I catch the glimpse of the blackboard - the professor is there, hard at work writing out some stuff that can't comprehend. Double checked the name of the lecture - computer architecture.

8.30 - so it begins, I remember taking a place along the front rows in order to see more clearly. Professor turns to us and just starts the lecture, saying that he'll introduce himself later at the end and there is no time to waste. OK...

And he just dumps the layout of x86 computer architecture and a mixture of basic ASM jargon on us WITHOUT TURNING TO US FOR LIKE 30 MINS while writing things out on the blackboard.

The he finally turns 180 degrees very quickly, evaluates our expression (I know mine was WTF is this I don't even understand half the words), sighs, turns back and continues with the lecture.