A bodybuilder applies tan on another participant during the Mr and Mrs East Africa Natural Body Building Contest at Rupaz Gym in Eldoret, western Kenya, on October 8, 2022. 168 bodybuilders from Rwanda, Uganda, Ethiopia, Tanzania and Kenia participate in this competition in Eldoret, a city known as “The City of Champions” for producing some of the best long distance runners in the world, that has not hosted a bodybuilding event since 2015. (Photo by Patrick Meinhardt/AFP Photo)

A young man performs a wheelie on his bicycle during a stunt show in the Petare neighborhood of Caracas, Venezuela, on Sunday, October 31, 2021. (Photo by Pedro Ramses Mattey/Anadolu Agency via Getty Images)

Children enjoy and participate in a traditional street race of “carruchas”, the name for makeshift wooden cars in Caracas, Venezuela, Saturday, December 18, 2021. Children enjoyed the race marking 10 years of persevering this tradition. (Photo by Ariana Cubillos/AP Photo)

A Palestinian fisherman cleans up his fishing net after the Israeli decision to close Gaza's fishing zone, on the beach in Gaza City, Tuesday, August 18, 2020. (Photo by Khalil Hamra/AP Photo)

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.

Medics carry an injured at the explosion site in the busy center of Turkish capital, Ankara, Turkey, Sunday, March 13, 2016. The explosion is believed to have been caused by a car bomb that went off close to bus stops. News reports say the large explosion in the capital has caused several deaths and many casualties. (Photo by AP Photo)

The Komodo dragon (Varanus komodoensis) was the most popular species overall based on English language Wikipedia page views. It is the world’s largest lizard, living on the islands of Komodo, Rinca and other smaller islands, and on Flores island in Indonesia. (Photo by Eric Nathan/Alamy)