The problem is thinking of one that's actually funny and not just sad...
hm...
Here's one that's kind of funny and happy, I think! (and not really bad-- but all of my bad ones don't have any funny aspects to them -__- so I won't share those.)
XD
I was in the art room with a couple of other stragglers on exam day- after the written exam; to finish/improve our final art pieces.
The art teacher; for as long as I could remember him- was severely depressed. When I was only in grade 9- in his art class, I remember that he found his best friend's corpse after a freak accident... and he just wasn't the same after that. He was always cold and sad for all the years I had him as my art teacher.
This day was different though!
I'd look up from my canvas and see him sitting at his desk, grinning to himself.
It was weird... he never grinned like that!
Finally, I went over to his desk to ask him what was going on.
He looked up at me and smiled, saying; "I've suddenly had an epiphany!"
The other stragglers looked up as well, wondering what he meant.
"I think I'm going to be okay now. I feel good-- normal. The best I've felt in years!"
We couldn't help but think that he was maybe a bit unbalanced... maybe he took too many uppers? But at the same time, we were all pretty excited for him.
He got out of his chair suddenly and asked each of us what we wanted from the cafeteria, because he was treating us to a snack.
XD
And we all celebrated and pat him on the back.
As far as I know, he's been a much more positive person in general since I graduated school. He still teaches; he's traveled around a bit, he and his wife had another baby--- although it was strange that he suddenly just felt better; I guess some people would see it as a miracle.
Some teachers are hard-a$$es. Some teachers are awesome. He was one of those teachers I would never forget as the awesome teacher who was also pretty strict--- but great to his students nonetheless.
Why was it a bad experience for me?
It was really awkward... I was confused, actually- when he first told me.
ALSO-- his written exams in art history were always KILLER!
That year it took most of the kids in the class the entire 3 hour time limit to write it. -___-
The exam was 18 pages long and included 12 mini essay questions. lol
I never ever had another exam that rough- especially not in college. Exams were a piece of cake then! haha
That was an overall good day though, I think.
It was raining all morning but it cleared up after his epiphany; so the hour walk home was nice!

Life is strange.