The Five Second Rule - Proven

Apparently, it's closer to 30 seconds.

Working under the supervision of assistant professor Anne Bernhard, the two cell-and-molecular biology students experimented with samples of wet food (apple slices) and dry food (Skittles candy); food samples were left on the floor for various intervals, then analyzed for contamination, the college said.

According to Goettsche and Moin, the results of their research showed that people can wait as long as 30 seconds to pick up wet foods and even longer for dry foods.