I don't think I have many stories like you guys but let me think a little here, searching deep in my brain.
Ah. I remember one story, now you all seat there, grab some hot chocolate.
One time I was at my friend's house (we used to have these sleepovers that took all week when we were without school at the time) and we were playing D&D, it was my first time playing it. We had a few sessions through the week and in one of the sessions I was having a horrible stomachache and I was thinking "man oh man, I'm gonna shit myself anytime now." (Note: I dislike using the bathroom to poop in others people's house). Something was happening in the D&D session and I was very quiet trying to focus in the chaos happening in my stomach. My friend (the GM of the D&D) asked me "Teru what are you going to do?" to which I answered "Before I tell you this, can I poop in your bathroom?"
All of my friends and I got silent for a little and then the GM said "Sure? Why not?" and I rushed to the bathroom. Until this day whenever one of us remembers this story, it always ends up in laughs.