Upon his engagement his mama told him he was the son of a God. "If you ask nicely, I’m sure your dad would be good for a wedding present."
So he went up the hill to the appointed Godspot and, lo and behold, his dad beamed magnanimously and said: "Good on you son. Here! Have two pressies. This one has all the cash you will ever need, but this other one must not be opened until I say so".
The marriage went well, but on the honeymoon boat it was already nag, nag, nag from the bride. "Come on — open it now — we are married. It’s half mine anyway. Well, just a peep won’t hurt."
But it did. The package, unlike PANDORA’s box, contained only goodies, but goodies in overflowing abundance. Soon there was no room on the boat. Soon there was no boat — it began to sink under the weight of the new cargo. Soon there were no newlyweds because they went down with the boat.
The moral of this tale: when the Gods say Don’t Open The Box! they really mean it.