Wikipedia may not always be the most accurate source of information. (I wouldn’t blame you for rolling your eyes at this point.) But because Wikipedia is user-generated, even obscure cultural references are written up into proper posts.
The five second rule is NOT an obscure cultural reference. It is, in fact, a life food saver. But never mind that. The article is way too well-worded for something like the five-second rule. Compare this to the Urban Dictionary entry for the Five Second Rule, which is more colloquial.
At any rate, the Wikipedia article also includes this cartoon, which I thought was funny:
Why am I writing about the five-second rule? I’m a bit swamped with work today. No time to write about what I really wanted to write about, which I think will have to wait till the weekend.