Ahahaha, yes. I remember this all too clearly. While it may not have been the funniest thing, well, it cracked me up.
Okay. So, I had been madly in love with my best friend for about half the year. She was dating another guy, who she was madly in love with. She was aware that I liked her, and at some points she returned the affections, but she always stayed with the boyfriend.
Now, it was nearing the end of the year, and we had to select the courses we wanted to study next year. Given that she was my best friend, I did the same courses as her.
So, on the last day of term, me, my best friend, and her boyfriend were all standing together, talking to my teacher. She ended up asking us what courses we were taking. The boyfriend said that he was taking so and so, and then the best friend told the teacher what she was taking. The teacher then asked me. I told her that I was taking the same as my best friend.
And then, for the first time she had ever done this, she said in a very amused, but slightly seductive voice: "Well, what a coincidence".
I think mortified would be the best description of my reaction.
Although it didn't stop me winking at the boyfriend over the teacher's shoulder.