Transcript:
Riley: Granddad, what do women like more, "Gangsta Lovin'" or "Thug Lovin'"?
Granddad: Thug Lovin'.
Riley: Thank you, granddad.
Granddad: Don't mention it.
Riley: Do you even know the difference?!
Granddad: Ok, so you caught me humoring you. Go away...
The scene of this action - decorating a Christmas tree, with the notable absence of the children in residence - may be what makes it so surprisingly funny. McG can be subtler than we realize even while being outrageously brutal in his humor.