I'm going to leave a mess on the table so the people who invaded our space have to clean it up
Why do you want to do that?
I want to see the look on their faces.
That might be funny. It's not right to leave your mess for other people to clean up though, even if they are invading your space.
I'm going to tell them that the meal was a mess and it's their fault
It's wrong to blame others for your mess. How would you feel if someone blamed you for something you didn't do?