if you drop a piece of food on the ground (most likely, something that you've taken a long time to prepare, at a time of crisis right before this needs to be served, or after a long day), you have 5 seconds to pick it up and it will be fine. While it still has germs, these 3 words just may give you peace of mind.
Crap! I just dropped the souffle I've been working on for 3 hours! And Jackie is getting here in 5 minutes! *picks it up* 5 second rule will have to do I guess.