Today I had the idea to go into Sarah's art studio and mix all her paints together.
I would you do something like that to her?
I wanted Sarah to be mad at me for doing so, so she will use all her anger and stop being so bitchy with me.
It's not okay to ruin someone's paint supplies. They probably will still be angry at you since anger doesn't have a limit. They'll be forced to pay money to replace what you ruined.
I'm going to pretend that they are all the same.
I highly doubt pretending that they are all the same as gonna convince her that the paints weren't messed with. Fighting anger with anger isn't practical because it's not going to give you the end result that you want. Simple communication could resolve issues between you and her.