It's funny because mine was math so pure that the final was
"Imagine a function that does xxxxxxxxxxx. What would happen if
C) ppp ddd qqq?"
No numbers. Fuckin' essay-style with roll-your-own functions and derivation. It was eye-poppingly hardcore.
The rate of attrition in that class was such that 15% of the people who started it finished it. I got a 25% on the one assignment he gave all quarter and immediately asked him what I could do to resurrect my grade. he said "relax! You were in the top 20%!"
When all of us were heads down and desperate on that final he said "if you take it home and study I will give you an A."
Fuckin' A I'll bet I could teach Diff EQ even now and it's been 20 years. That class was goddamn amazing.