A few times I made the mistake of getting the X21 around school finish, and it was a terrifying experience. I think when school kids get on, drivers just completely forget about capacity limits as they just cram them on until no more can fit. One time I remember it being full of kids standing upstairs, with some sitting on the stairs and even on the floor! I had my laptop on the table, and one shouted at me to move it so they could sit on the table. I obviously told them where to go.

As I've said before, I refused to get the scholars bus for most of my time at school because the experience was absolutely horrific. 
And, once our school moved site I never once used the scholars bus for the ~5 years I was there. I would always get the public bus, but the most trouble we'd cause would be laughing at the dating section in the Metro!