I was teaching pottery in high school. The class was 10th -12th grade. i had a bunch of really crazy seionor boys.
One time I was loading the kiln, and all the kids were sitting at this big long wood shop like table working on their clay projects. Every time I looked over they would all smile these big cheesy smiles. I was only a few feet away. I thought it was weird but I just would smile back and keep loading the kiln.
A girl walks over to me and wispers in my ear Mrs. Foster... Your zipper is down! I look down and sure enough my zipper is wide open! I look up and every student is looking at me with big stupid grins on their faces... I have one second to react. So I say, (As I proudly zip my pants back up) Oh well at least I was going comando today!

THe whole clas about died with laughter and the embarressment was broken!!!
another time (Same class)
I had to show the class how to pull a mug handle. They were all making mugs on the wheel. When you make a mug handle, you have to keep wetting your hands, and the clay and pull this cone shape, into a long handle. It looks very sexual.

So I know how it looks and I know these kids are not let me off the hook about it. I call them over to the long table so they can stand around and see what I'm doing. I start, I'm explaining and making my handle... and I am not making eye contact with any of them! There is not one word coming from the kids. (NOT ONE WORD) so I make the mistake of looking at this one girl.... she has her eyes WIDE OPEN ...and she is trying soooooo hard not to laugh. I knew they were all making faces at each other sooooo i say, ok we all know how this looks lets just get this over with already!!!!
Well they didn't know I KNEW what it looked like!!!! (Don't ask me why they didn't think I knew... I was married and I'm not that much of a dork!) Any way the boys were on the floor with feet in the air laughing...(No kidding) and the girls were just laughing their heads off....
The next day all the boys were MAKING MUG HANDLES AND SHOW OFF ALL ABOUT IN CLASS!!!!