A Sandra and Jonnie betting pool

How long do you think it will be before Sandra beats the crap out of Jonnie, and what will be the straw that breaks the camel's back?
 
I think it will be after the third night of playing Mr. Shaving Cream Head.
 
I can just hear Sandra now ...
"Jonnie, Nehmen, das von Rasierschaum und ihn herauf Ihren Esel zu haften kann!"