What do u miss the most about school days?

When we are talking about those school days, its my best friend which I missed the most often for me I equate school with my best friend. This friend of mine had been a best friend since were in the pre school years since we've been classmates even at early days, we are neighbors as well, basically we see each other everyday. We grow together and become classmates until high school, we know each other very very well. We can enumerate our teachers and know each other's crush and lovers. Eventually time has separated our ways when we took college and family life. But half of my life I have spent it with him.