Reply #164: Whether you do or don't you are missing (or ignoring) the point.

[Selwynn]

The point is not that the claim is easy to disprove given the understood nature of clowns in your living room.

That doesn't change the fact that you cannot in fact say with certainty that you "know" clowns are not in your living room, regardless of the understood nature of your living room. The reason for this is the simple reality that your senses could be deceiving you and there is no objective way to verify that they are not.

This is essentially the BIV argument from epistemology.

I concede in the specific context of the larger discussion we were having, this point is parenthetical at best and largely insignificant to the direct issues at hand. I've already mentioned that I've rethought my stance in proving a negative a little bit in light of your good critique, and I don't want you to mistake this as a recant of that.