overheard on the train

I wasn't actually listening to the people next to me on the train the other day; in fact I was trying not to listen, so that I could concentrate on my book.  However, I couldn't help but hear their concluding sentence:

I'll see you then, then.

That is, "I'll see you at that time, in that case".  Not as good as the three thats, but enough to make me smile (into my book).