Four Letter Weirds: "That"

"That" is of course one of the most basic and necessary words in the English language. But once it occurred to me that it was one word unlike others in that it can be CHAINED almost infinitely and still make sense.

If some says, "I like the phone that that guy had," that's two in a row. But if you make references you can loop indefinitely, and still make sense.

Example: "The 'that that' that that guy said made complete sense!"

To which someone could reply, "True, but that 'that that that that' that YOU just said ALSO makes sense!

A fully comprehensible, meaningful and grammatically correct sentence with a string of six "thats" in a row just seems incredible to me, but them I'm kind of a "weird word" aficionado. And since you can make direct references without requiring any change in the words you use, it's also completely meaningful (if pointless) to say, "Even that 'that that that that that that' that that guy just said was correct"--NINE "thats" in a row!

At this point someone usually suggests that I "get a life." But then I ask, "what, a life like that that that other guy has?"

You do have to take care not to get caught in a "that" loop. After all...
that "that that that that that that that that that" that that
other guy said was just ridiculous!