The 5 Second Rule
A lot of people drop food on the ground. How long do you have to pick it up, before germs make it a lost cause? Some people say 5 seconds. Especially in China to foreigners, without good chopstick skills.
Finally somebody has given this claim some scientific scrutiny.
While 5 seconds allows less time for germs to transfer than a minute, that 5 seconds is still enough to transfer germs like E.Coli in sufficient quantities to make that person sick. Not to mention germs may not be the only problem on whatever surface the food got dropped on.