OK, so this didn't come from a fortune cookie, even if it looks like it.
The toilet had but one handle, which would've matched the "it will malfunction" bit of the sentence so much better.
Then again, maybe rough treatment of the handle causes the toilet to malfunction.
This is the problem with pronouns. They need to match the antecedent (the noun that comes first). If a sentence (or toilet fortune) is missing its antecedent, confusion and possibly bathroom flooding can result.
In any case, all of this makes us wonder about the people who clobber public toilet handles. The less contact with these, the better. But maybe that's just us.