A common superstition, the five-second rule states that food dropped on the ground will not be contaminated with bacteria if it is picked up within five seconds of being dropped. Some may earnestly believe this assertion, whereas other people employ the rule as a polite social fiction that will allow them to still eat a lightly-contaminated piece of food, despite the potential reservations of their peers.

There are many variations on the rule. Sometimes the time limit is modified. In some variations, the person picking up the food arbitrarily extends the time limit based on the actual amount of time required to retrieve the food. In Russia there exists a similar rule: "Promptly picked up is not considered fallen".

The five-second rule has received some scholarly attention and has been studied as both a public health recommendation and as a sociological effect.

In 2003, intern Jillian Clarke of the University of Illinois at Urbana–Champaign found in a survey that 56% of the men and 70% of the women surveyed were familiar with the five-second rule. She also determined that a variety of foods were significantly contaminated by even brief exposure to a tile inoculated with E. coli. On the other hand, Clarke found no significant evidence of contamination on public flooring. Clarke received the 2004 Ig Nobel Prize in public health for this work.

Justin Drew Bieber ( /ˈbiːbər/ BEE-bər, born March 1, 1994) is a Canadian Pop/R&B singer-songwriter, musician, and actor. Bieber was discovered in 2008 by Scooter Braun, who came across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher, and then to a recording contract with Island Records offered by L.A. Reid. Bieber's debut single, "One Time", was released in 2009 and peaked in the top twenty in Canada and charted in the top thirty in several international markets. His debut album, the seven-track EP My World, followed in November 2009, and was soon certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.

Ricky Dene Gervais (/dʒərˈveɪz/; born 25 June 1961) is an English comedian, actor, director, producer, musician, writer, and former radio presenter.

Gervais achieved mainstream fame with his television series The Office and the subsequent series Extras, both of which he co-wrote and co-directed with frequent collaborator Stephen Merchant. In addition to writing and directing the shows, Gervais played the lead roles of David Brent in The Office and Andy Millman in Extras. Gervais has also starred in a number of Hollywood films, assuming leading roles in Ghost Town and The Invention of Lying. He has performed on four sell-out stand-up comedy tours, written the best-selling Flanimals book series and starred with Merchant and Karl Pilkington in the most downloaded podcast in the world as of March 2009,The Ricky Gervais Show.

He has won multiple awards and honours, including seven BAFTA Awards, five British Comedy Awards, two Emmy Awards, three Golden Globe Awards and the 2006 Rose d'Or, as well as a Screen Actors Guild Award nomination. In 2007 he was voted the 11th greatest stand-up comic on Channel 4's 100 Greatest Stand-Ups and again in the updated 2010 list as the 3rd greatest stand-up comic. In 2010 he was named on the TIME 100 list of the world's most influential people.