Most bullies are the product of a stressful and often abusive home life. Next time a bully threatens or attacks you, just yell, 'Don't abuse me like your parents abuse you!' Then call children's services and tell them you saw this bully crying in the bathroom and you're worried about him. Bam! He just got moved to a foster home.
Of course, to avoid getting stuck in that convo with someone you dislike or feel uncomfortable around, don't be passive, be proactive. Do not let them direct your interaction on their terms, do it on yours. Ask a Misdirection Question--something too difficult to answer quickly--e.g., 'What's Congress up to?' or 'You ever learn any cool science?' When you ask the question, don't make eye contact, keep moving and get out of there. Do not wait for a response and deny ever asking it. Repeat these actions until you are never again spoken to by that individual (about four times).
Some PR is about getting information about a great product or thingy out to the people who would enjoy it, while other PR is about creating a web of lies that conceals the fact that your company harnesses the energy produced by rape and uses it to make a chemical that kills forests for fun. Either way, you're going to need it.
High School: Oh, man. This is where boys and girls go from tweens to teens and become complicated and cruel. Girls play sick mind games; boys try to pull each other's penises off and throw them in the bushes. If you can, buy the most expensive jeans in a two-hundred-mile radius of your town and wear them on your first day. If anyone asks how you could afford them say that your father is the president of Ashton Kutcher. When they are like, 'Ashton Kutcher has a president?' answer, 'Yes.' Everyone will be in awe of you and you won't have to go through a lot of pain and cat fights.