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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

It’s your funeral!

exclam. If you do it, you will suffer all the consequences! Go if you want. It’s your funeral!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.