it seems to be related to the amount of people involved.
If you run away with a bag of cash, you'll get (metaphorically) beheaded.
If you and Fannie Mae and Freddie Mac and Countrywide run away with a bag of cash, prepare for a fairly bad spanking.
If you run away with a bag of cash, you'll get (metaphorically) beheaded.
If you and Fannie Mae and Freddie Mac and Countrywide run away with a bag of cash, prepare for a fairly bad spanking.
Edit: phrasing
I think you made a mistake. First sentence is supposed to be, "he has you by the balls."