Ohhhhh yessssss!!!! I remember both of them. Jha sir was a good guy at the core, but his ways of expression were hillarious. Guys used to ask him all sorts of questions, just to tick him off, while he would solve algebra equation on the board. Once we kept asking where did a certain variable x come from as the equation was being solved. First two or three times he explained patiently. However, soon he caught up with the joke and got pissed. I asked him, "ani sir, tyo x chai aba kaha bata aayo ta?" He literally screamed in his thick Janakpurey accent, "Uuuuuuudera aaayo!!" Purna Nepali sir was another namuna. Man, sometimes, we could smell alcohol in his breath. I guess the musicians need to drink just to exist as musicians. And he used to beat students. Once, we kept a count of his corporal punishments. Sad story is he found out about it and he got one of the students to confess the whole darn thing infront of the class. I think we were in class 7 or 8, so we were scared shitless.