I had to pee really bad while I was in the middle of a powerpoint presentation in front of class recently. Well first I thought I should try to hold it while I spoke, but holding it in only made me even more desperate. I finally reached the point where I had no choice but to just let it go and hope nobody would notice. I was quite surprised to do so well. I just stood there speaking, as I casually but quietly relaxed my tense muscles and just let the pee go flooding through my panties and running down my legs underneath my long dress. It seemed like I was peeing forever by the time it stopped. It lasted for like a minute at least. I guess I really had to go bad. But I felt so much better afterward, although I couldn't help but feel embarrassed even without anybody noticing me the whole time.