Always second grade... I think most kids just forget about it.
I had an accident in second grade too. We were outside for gym class and the teacher wouldn't let me go back in because there was no one to walk me in and watch the rest of the class, so during a squatting excercise it came out.
Then he had the bright idea that it may be safe to have another girl from class walk me to the nurses station so at least we weren't walking back to the school alone... why didn't he think of that for the potty??
But I can't remember anyone making fun of me too badly, so it must not have been too bad. lol I was pretty embarrassed though.
I hope everything is okay with your little boy.
He may have just been having a nightmare reliving the classroom incident too...
Or, ugh, I'm actually going to go there with this... I wet the bed off and on randomly up til sometime in middle school because my body had a hard time waking up or something, but I would dream about having to pee and going to a toilet and it would be SOOO vivid, and when I did wake up I'd be aboslutely mortified to find out the toilet was in my dream and I had actually wet the bed.
But yeah, maybe ask him if he was dreaming about anything and if so what?