The emperor’s clothes exist in a super-position of both existing and non-existing. When the tide goes out, this results in the wave function collapse of the super-positional state of the emperor’s clothes, thus demonstrating the observer effect on textile systems.

Just a joke. It means that you can’t tell who lost their shirt til all the bubbles are drained from the pool, and we’re left with ourselves, each other, and our new shared reality.

It means that it's easier to cheat when times are good. But when there's an economic downturn (tide goes out, in the metaphor), that's when concealed problems can't be hidden any longer.

That it's easy to hide or overlook financial problems in a good market. Once the market is tougher, those problems come to light.

Assuming naked swimmers wouldn't continue to swim as the tide goes out, you would find them laying on the sandy beach with their no-nos hanging out.

Unless the swimmers are to comfortable in the water to see the tide going out. In which case they are caught with their pants down, well without pants to begin with. The smart swimmers are drinking cocktails by then, courtesy of SoftBank more often than not.