Bin there, done that.
A student in my class made me laugh today. His name is Khalid and is one of the quieter ones; very unassuming, polite and no bother at all.
When I got to the class, he was sat in the back row with his head bowed low, his face as contorted as he could manage and his eyes cocked in completely opposite directions. Understandably, I was a bit worried when I saw him and was straight up to ask if he was okay.
He then sat bolt upright, flashed a big grin and said "Yes, I'm fine thanks!"
That's definitely the oddest thing a student has done yet. I've been sporadically bursting into laughter throughout the day just thinking about it!
- Canon PowerShot S2 IS