It is rude to embarrass a class mate.
Tim is at school and notices that his classmate Bill has a piece of toilet paper stuck to his shoe.
Tim wants to inform Bill about the toilet paper on his shoe.
Tim waits until class is over and discretely informs Bill about the toilet paper on his shoe.
Tim tells Bill that there is toilet paper stuck to his shoe in front of the whole class.
Bill is thankful to Tim and removes the toilet paper without anyone else noticing.
Many of the students laugh at Bill, and he feels embarrassed.