How to bribe mom to let me dye hair?

My mom is stubborn and she wont even let me dye my hair full blonde she only lets me highlight it and I totally understand that dyeing hair is costly. My mom gets mad easily and I need to know a really good bribe deal or something that my mom would think "ok ill let you dye your hair black" or something really good to get her think something like that. Anybody got any suggestions? I really appreciate it. I just want to get rid of the brown in my hair and get rid of the blonde before i go on vacation in a couple of weeks. Thank you to all that help and hopefully whatever you guys/girls think of will work. *thumbs up.* :D