It’s your funeral!

it's (one's) funeral

A (usually humorous) threat indicating that if one does or doesn't do something, it will bring about negative consequences. OK, fine, don't do what Mom said. It's your funeral! If Billy goes in my room when I'm not here, it's his funeral.
See also: funeral

It’s your funeral!

exclam. If you do it, you will suffer all the consequences! Go if you want. It’s your funeral!