I think that the electrons slowed down so much that they condensed. In turn the Ozone created as a result of condensation combined with free Hydrogen atoms and, of course, produced H2O. Hey... "It could Happen" !
Or something really bad happened and there is water running through the conduit that serves the outlet.
Either way, I am just fine looking at the picture and NOT trying to find the problem.
If sense were so common everyone would have it !
All opinions expressed are my own. Any advice provided is based on personal experience, generally accepted fact or publicly available information. As such, it is worth exactly what you paid for it, not a penny more not a penny less !!