A meteorite of the swarm of meteorites Perseida flies above the Ujudvar TV Tower as seen from Ujudvar, Hungary, late Friday, August 13, 2021. Perseidas, one of the brightest meteorite swarms, consist of a multitude of stellar particles which due to their high speed glow up and burn by entering Earth's atmosphere. (Photo by Gyorgy Varga/MTI via AP Photo)

Getting her tongue pierced was “exciting and scary” says a teen who succumbed to pressure from her best friend in Austin, Texas, February 22, 2008. This image is featured in National Geographic's exhibition “Women of Vision: National Geographic Photographers on Assignment”, on view at the Palm Beach Photographic Centre, Jan. 22 - Mar. 22, 2015. (Photo by Kitra Cahana/National Geographic)

People perform acroyoga style exercices at South Pointe in Miami Beach, Florida, on February 8, 2023. (Photo by Chandan Khanna/AFP Photo)

High-wire artist Kane Petersen successfully walks a tightrope 300 metres above the ground at Eureka Skydeck on September 16, 2015 in Melbourne, Australia. The walk was the highest tightrope walk ever attempted in the Southern Hemisphere. The stunt is to mark the arrival of the film “The Walk” to Australian cinemas in October. The stunt saw Kane mimic the film's French high-wire artist Philippe Petit, who successfully walked between the twin towers of the World Trade Center in 1974. (Photo by Scott Barbour/Getty Images)

Everyone wants to get something for nothing - whether it's a lucky upgrade that means you can turn left when you get on a plane instead or heading off into the economy seats, or even getting a few extra features thrown in for free when you buy a new car.

As some of the sharpest businesses around, no-one understands this quite as well as casinos and that's why they all have a system that they call comps. It's short for "complimentary offers" and these are special treats specially designed to reward you for your loyalty to the casino in question. They're basically bonuses.

Fruit vendors chew qat, a mild stimulant, amid concerns of the spread of the coronavirus disease (COVID-19) at a fruit market in Sanaa, Yemen on June 1, 2020. (Photo by Khaled Abdullah/Reuters)

A family rides a bike amid rain in Lahore on October 16, 2023. (Photo by Arif Ali/AFP Photo)

A pro-Palestinian demonstrator sticks her tongue out as she is escorted to a police vehicle outside a building housing the Israeli Consulate in San Francisco, Monday, June 3, 2024. Police arrested Palestinian supporters Monday who occupied the lobby of the building. (Photo by Jeff Chiu/AP Photo)