My sister works at a nice restaurant so I am going to go eat there and purposely sit at one of her tables.
Why do you want to sit at one of her tables?
I can't wait to mess with her at work.
Purposefully sitting in your sister's station at work just to mess with her is interfering in her job. This could get her fired.
Oh whatever, like she wouldn't deserve it.
While to you this is a funny prank, to her it could get her into a lot of trouble. You may think that she deserves it, but would you like it if she came to your job just to start trouble? Be kind to your family.