Warning! Hydrogen in water!
Monday, July 17th, 2006Article: Water without hydrogen would warrant warnings (Louisville, KY Courier Journal)

Quote: David Karem, the Waterfront Development Corp.’s executive director, had the signs made to try to keep people out of the water after health officials raised concerns about bacteria in the fountains last year.
However, tests this year show the fountains meeting swimming pool standards.
Karem said he was counting on a lack of understanding about water’s chemical makeup, and he thought that suggesting a link to one of the world’s most dangerous weapons—the hydrogen bomb—might keep them from jumping in.
Yeah…
I suppose that will keep most away.
Personally, if faced with that sign, although I know the chemical makeup of water, I would probably personally assume that the sign designer was an idiot, and that there was some valid problem with the water…
OTOH, I would also keep out if it simply said “Keep out”........... So this might work for those that don’t catch on, who otherwise would ignore a simple rule to refrain otherwise…
Rather droll, I suppose.