Being the brick-wall authority figures that they are, most sane parents will at this point deny any glimpse of access to what it is you are trying to get. This page is devoted to breaking down that brick wall.
Now, most people think that if they suck up to their parents as much as possible that they will give into their demands. This is wrong. Trying be extra nice to your parents will fill them with suspicion and will give them an early warning that you are about to ask for something extraordinary. Do not suck up to your parents.
The key is all in the timing. It is usually best to wait until after they have just finished eating dinner. They will have a full stomach and will have no immediate stressors on mind. These few minutes are their weak point. Take full advantage of it.

With your parent in a good mood, and his or her alertness at extremely low levels you must now seize the opportunity to calmly ask for what it is you want. At this point it is not uncommon for your parent to completely lose control and freak out.

What you want to do now is stay completely calm and give your parent the stare down. Don't bother arguing. That won't solve anything. And do not under any circumstances allow your parent to change the subject. Keep the pressure on them without losing your composure. Once your parent gets over realizing what it is you want, they will begin to question whether or not they were being too hard on you. "Maybe I'm wrong," they'll think. "Maybe it isn't such a bad idea. They seem responsible enough."

Your problems are solved, and your parent won't think twice about the mistake they just made. Variations of this technique will have to be implemented in the future, however, as parents grow accustomed to your effective procedures.
