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Check yourself before you shrek yourself 

Take a chill pill and look at your actions. Examine what you're next action because right now, you're heading in a bad direction.
Person: I think I'll go see La La Land!

Me: Check yourself before you shrek yourself, dickhead.

Check yourself, before you Shrek yourself 

To check your actions before you go off and do something stupid, and Shrek the almighty ogre lord decides to kill you.
Man: I hear investing in bitcoin is the way to go nowadays
Man's friend: Check yourself, before you Shrek yourself