When I was a schoolboy, I was usually polite artistic and well mannered. It was the 60's and naughty children were frequently spanked or caned.
I had witnessed several public spankings, including an 'underpants down special,' administered by an angry male teacher as a young lad lay wailing across his knees. Also, quite a few spankings across boys' underpants AND girls' knickers.
Being seen, by others, in your underwear was embarassing, but not uncommon. I sometimes forgot my PE kit and was made to do the lesson in my pants and vest (in front of girls). I used to squirm and once pleaded to be allowed to miss the lesson. My teacher (a female) ordered me to ***** to my underwear otherwise she said she would remove my pants, herself, and make me go naked. I believed her, so I ******** to my undies.
I even saw an occasional young lad stand outside the headmaster's room absolutely naked. Waiting to be called in and waiting to be THRASHED!!
I did receive some discipline and was, on two occasions, spanked across a male and female teacher's knees for misbehaving. Fortunately the beatings were in private.
But, on one occasion, I was just in a plain daft state of mind. I remember calling out answers to questions (knowing they were wrong), putting on a silly squeeky voice when talking, kicking a girl who sat in front of me and laughing for no reason. I was just plain daft, and I don't know why!!
I received some stern warnings from the middle aged female teacher (who no-one in the school liked). Then, after pushing my luck too far, she sent a kid to summon the headteacher.
He grunted into the room and, after being informed of my bad behaviour, he boomed for me to come out the front. Without questioning or talking to me, he smacked me across the back of my leg. That shocked me. Then he told a girl to bring a chair to the front of the class. He sat on it and grasped my shirt collar. Then, with one huff, he hauled me across his knees. My trousers were pulled down in a second. Then...off they came. The brute whacked me full force across my white, thin underpants and I howled like a wolf with it's claws on fire. I was dazed and heard him say something to the same girl. A few moments later, I remember seeing her (through the misty tears) handing him the cane. I panicked and began kicking, trying to get up. But another whack across my pants soon calmed me down.
Then...oh no! No! NOO! Please NO!! I screamed and yelled, as I felt the brute's hand take hold of the elasticated waste of my underpants. NO! NO! NOOO! But, down they came. Slowly. Almost artistically. Down, down down....OFF!!! Then FFWISH!! FFWISH!! I was soundly thrashed with my little boy's parts fully visible to everyone.
Everyone later said they saw my private parts. The girls teased me for months. They also told me it was the best thrashing they'd ever seen.
I did receive to more bare bottom punishments during my school career, but this was the most humiliating, although my second one (in high school) was also very very embarassing).