When I was in college taking a Computer Basics class... We also had a substitute because the instructor was at some deal out of town for a week.
Like you, I viewed this class as a mickey-mouse cakewalk, as well as an easy 4.0.
This particular day, we were discussing file naming conventions. Now this was before Win95 and long filenames (unless you had a Mac). It was all 8.3 back then. The bulk of the discussion was common extensions and what they represented.
.TXT = text file.
.EXE = Executable program
.COM = Command
.BAT = Batch file
.BAS = BASIC program
and so on.
So the instructor poses a question to the class:
"Suppose you write a dumb little BASIC program. When you save that program, you give it the name DUMB."
<Writes filename on the blackboard and stands in front of it.>
"What would your file name be?"
OK, I'm chomping at the bit to get at this one. She opened that door and I feel it's my duty as a smart-*** to waltz through it in grandiose fashion. So I'm doing my best Horschak impression, which works.
"Would that be DUMBASS?" (DUMB.BAS - Get it?)
Needless to say, the rest of the class fell over laughing and the substitute turned beet read. At that moment, I'm sure she made a mental note to use another example if she's ever teaching this segment of this course again.
I found out after the fact that this substitute was the regular instructor's sister and I really ****ed her off. I guess she's pretty humorless.
I was kind and wrote an apology note on the back of the final.
Oh, and I still got that easy 4.0.