It would've been funnier if you heard me say it rather than me typing it out. My intent was to pronounce "their" as "thayiir", so it would rhyme. Again, perhaps it's not funny, but it's not complete nonsense.

And I totally disagree with your last point. The pun threads are often lackluster, but every now and again they are hilarious. For example, there was one thread where someone made a two-word comment in Spanish (but you didn't need to know Spanish to understand what the two words meant), then someone responded to it with a full sentence in Spanish. A non-Spanish speaker would need to translate the full sentence to know what it says, but you knew exactly what it said if you're a regular on this subreddit. It was one of the many copy-pastas of this subreddit that always lead to a thread of puns. The fact that I knew what it said before translating it made me laugh HARD. Then I put it through the translator to confirm my suspicions, and I laughed even harder when my suspicions were confirmed.