Without having anything to compare it to for when he is 'normal' I can't really comment on this except to say he reminds me of some of the teachers I have had that went out of their way to try to make boring subjects interesting.
Yes, I have had teachers just like this guy...only they weren't high. Some of them were my favorite teachers.
I don't know about teaching business in a university, but this guy would sure make a great high school history teacher.
That short clip I found seems a whole lot different after watching the full 35 minutes from the one noth(a)nk.you posted.