241543903 (a.k.a “Heads in Freezers”) is a numerical keyword associated with a photo meme that involves people taking pictures with their heads in the freezer & sharing them online. By tagging a series of image files with a cryptic number, a high level of search engine optimization can be easily achieved. As a result, typing “241543903” into image search engines like Google Images successfully yields pages after pages of pictures showing people’s heads in freezers.
In 2009, David Horvitz started the “Heads in Freezers” meme. Participants took photos of their heads in freezers, tagged them with “241543903” and uploaded them to social media sites like Tumblr.

A man wearing a face mask walks past a picture of a Russian tank in central Moscow on June 18, 2020. Russia's President Putin on June 24 will preside over a massive military parade to mark Soviet victory in World War II, which was postponed due to the coronavirus pandemic. (Photo by Yuri Kadobnov/AFP Photo)

Oscars “Super Fan” Vivianne Robinson wearing Hollywood-themed attire, is pictured near the red carpet arrivals area, ahead of the 95th Academy Awards, in Hollywood, California, on March 10, 2023. The red carpet for the Oscars airing on March 12, 2023, is champagne-color for 2023. (Photo by Stefani Reynolds/AFP Photo)

Heartlyn Rae duo (Alexis Driscoll and Julia Frys) poses for a picture in Barbie's Space Center during the World of Barbie immersive experience preview in Santa Monica, California, U.S., April 12, 2023. (Photo by Mario Anzuoni/Reuters)

Sparks fly in front of the Milky Way in Himachal Pradesh, India on May 12, 2023. Lit steel wool is spun in front of the stunning cluster of stars and over a pool of water. The scene was pictured in the Himalayas, by using a 30 second exposure to capture the stars and movement of sparks. (Photo by Ganesh Bagal/Solent News/Rex Features/Shutterstock)

People take pictures near a Soviet flag flying on an embankment in Saint Petersburg, Russia on June 17, 2023. The flags of Russia, the USSR, and the Russian Empire were installed on the shore to mark the anniversaries of each flag's adoption. (Photo by Anton Vaganov/Reuters)

An elephant with a shackled leg is pictured at the Hanoi Zoo in Hanoi on August 16, 2023. Legs in iron chains and unable to roam freely, the treatment of two elderly elephants at the Hanoi public zoo has drawn outrage from animal lovers across Vietnam. (Photo by Nhac Nguyen/AFP Photo)

The rabbit population of San Juan Island, brought in to feed lighthouse keepers, got so big that in the 1930s foxes were introduced to kill them. Although they are red foxes, their coats can be orange, silver, black or multi-coloured. Picture date: September 2023. (Photo by Jun Zuo/Solent News)