A man takes photo of his colleague with a mobile phone on the burning oil tanker at the ship-breaking yard in Gaddani, Pakistan, November 2, 2016. Reports state that at least eighteen workers were killed and more than 100 were wounded in a blast at Gaddani ship breaking yard near Karachi on 01 November. Initial reports suggest the blast occurred when a gas cylinder exploded inside an oil tanker being broken up for scrap. (Photo by Akhtar Soomro/Reuters)

Miniature spring-wound 35-mm film camera in a modified cigarette pack. The Tessina’s small size and quiet operation provided more options for concealment than most commercially available models. (Photo by Central Intelligence Agency)

A timber truck driver (L) dressed as Father Frost is saluted by a soldier at the Kremlin's Spasskiye (Saviour) Gate in Moscow, Russian Federation, on December 24, 2013. (Photo by Vyacheslav Prokofyev/ITAR-TASS/ZUMA Press)

A man rides a horse at a playground on a hill in Kabul April 19, 2015. (Photo by Mohammad Ismail/Reuters)

ATTENTION PLEASE! This publication is NOT about cute animals! This is a compilation of photographs of DIFFERENT content! Some photos may SHOCK YOU.

Photo: An eleven-week-old lion cub growls as she plays with a stuffed toy at the San Francisco Zoo April 25, 2003 in San Francisco, California. The cub's mother, Kita, died two days after giving birth to her and her brother. Zookeepers have hand fed and cared for the two surviving cubs around the clock since their mother died. (Photo by Justin Sullivan/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.

Santa Claus wears a mask as he pushes a sleigh full of curbside grocery orders to an Aldi customer at a parking lot in Palatine, Ill., Saturday, December 19, 2020. For this weekend only, Santa Claus is delivering groceries to Aldi customers in Palatine and several other towns in the Chicago area. (Photo by Nam Y. Huh/AP Photo)

A man shows his inked finger after casting his ballot at a polling station during the second phase of voting of India's general elections in Masuda, Rajasthan state, on April 26, 2024. (Photo by Himanshu Sharma/AFP Photo)