I'm a bit confused... You say the teachers play favorites and you don't like it but aren't you doing the same thing by saying "I hate this teacher so I'm gonna torment her but I like this one so I'll be nice to her"?
I'm not too far ahead of you in age so don't think I'm just some 'old bitty' giving you a lecture.
Stop making comments about how you respect those oldies with the bone problems. It's desrespectful and honestly, not an attractive attitude. I hope your dating standards aren't any higher than 'd-bag' because no one will date such a disrespectful punk. Who wants to take that kind of person home to their old parents with the OSTEOPOROSIS (pretty sure that's the word you're looking for to describe old women, thanks).
The prank would have been a lot funnier if you had done it in good fun and not just to torment another person. She may be a crappy teacher but she is still a person. You do realize that, don't you? God I hope so....
I will admit, when I was in school, I had some crappy teachers who would hand out detentions just for raising your hand. I also had fair teachers who willingly explained that we are all people who deserve respect but we must give it in order to receive it.
I've had violent teachers. I've had perverted teachers. I've had amazing teachers. I treated them all the same. They had my respect and attention at all times. They were there to teach me. If they could do that, then they had a good student of me.
Granted, some did lose my respect for various reasons. One beat up a student. Another tried to do 'things' to a student. They lost my respect at the first sign that they didn't deserve it. However, I still attended class and behaved myself because I was there to learn and I couldn't do that if I was busy wasting my time thinking of new ways to torture a less than desirable teacher.
Please do everyone (including your poor parents) a favor and grow up. Stop harrassing people and tormenting them. It's not your right to treat people that way. Do you recall them giving you permission to make them feel inferior? Didn't think so...