Y'know, it's like. When an object enters the timestream, time's gotta correct itself, yeah? [He's digging up an odd little memory for this punchline, that's for sure. He was so proud of himself for referencing something so obviously high-brow and intellectual when he'd included it in his script for that old movie project but -

But that was a long time ago.]

So it's like - when there're four balls on the edge of a cliff and um, the first ball gets an exact copy of itself. Then th'first ball becomes the second one, and the second is the third, and so on, right?

[At this point he's lost track of why he thought telling this story was a good idea in the first place, since all his focus is now being wholly devoted to remembering how it ends.]

And the fourth ball - squeaky wheel - it falls off the edge. Time works like that. [He frowns, trying to remember. He had a point here.]