Negotiate:

Put a poster on your wall of a base jumper getting ready to dive off a cliff. Tell her you always wanted to fly and explain how one of your friends from school will be taking a class on basic parachute packing in preparation for his base jumping certification.

With that one percolating, drop hints that you've been eating lunch with XXXX the person she believes to be the biggest burned-out loser in school. "He's actually a really nice guy," tell her. Then a few days later, "We were talking about music and travel. He's actually a very interesting person." Play The Dead and Fish real loud in your room and ask her if she's ever heard about how people drive all over the country every summer going from concert to concert.

Finally, if all else fails, visit an army or marine recruiter, tell them you were thinking about a career in the military and give them your phone number. Make sure to bring home some brochures and leave them where they will be found. When confronted by your mom, tell her you are just looking for something different...an adventure.

I bet she buys you really nice panniers.