You've dug your grave and thrown me in it

When you take the rap for someone else's actions, normally unwittingly and without consenting, this is a useful phrase.

Joe: Hey, what's going on Jack? Why is there a body in my room?
Jack: If anyone asks, you killed him, I tried to stop you, and there are no other witnesses. Now I must be going. Bye! *drives away too fast*
Joe: *shouting after Jack* You can't do that man! That's out of order! Don't you get it? You've dug your grave and thrown me in it! Now it's my grave! Man, you gotta come back!