I just realized, I have to explain the joke so you guys will get it. *sigh*
In some churches, communion is open to anyone who has been baptised regardless of denomination or church affiliation at baptism. So, even though one may be confirmed or baptised at one church, it can be acceptable to go to another church and receive communion.
So I could go to the Memorial as an invited guest and ask an elder, "Uh, you DO believe in one baptism for the forgiveness of sins here, right? Yes? Oh thank goodness, I can receive communion then. THANKS! I feel better."
What could he POSSIBLY say? NO? HOW??? He'd have to explain this "144K-JW-only" heaven REALLY fast! And I might get REALLY loudly confused. "HUH???? You mean you invited us all here to tell us we weren't WORTHY of the sacrifice Christ made??? You're kidding me, right???? WHAT KINDA CHURCH IS THIS???" Every non-JW would be offended if they realized what failing to partake REALLY meant.