The food can remain on the floor for longer than five seconds, as long as you started reaching for it before the five seconds expired.
Chris: That sucks.
Jason: Nah, five second rule, I saved it.
Eddie - *picks up rasberry and eats it*
Bill - What the? Why did you eat that??? Naaasty...
Eddie - Five second rule.
Guy 1:But it fell on the floor...
Guy 2:But it wasn't there for five seconds..so according to the Five Second Rule..it's all good.