Guaranteed

As in this is guaranteed to do three things.

1. It is guaranteed to make the husband laugh long and hard
2. It is guaranteed to make his sister blow a freakin' gasket because she's a die hard creationist.
3. It is guaranteed to make sure much amusement is had by me while watching the two of them slug it out. (No pun intended, but am appreciating the one that sprung up there, thankyouverymuch.)

{One HUGE tip of the hat to Sheila)