Have you ever finished playing a game and been so into it that you can't stop thinking about it, even in day-to-day life?
I have. There was a whole week after playing Assassin's Creed where every rooftop looked like a potential escape route from any angry Borgias I might run into while wondering around Bristol city centre.
A bunch of other people clearly have too, as they've gone ahead and created real world versions of some of their favourite games. And these are 9 of the very best...
Subway Surfers - A great video, one heck of an ending.
Crossy Road - Do not try this at home folks.
Angry Birds - This one gets bonus points for being interactive.
Clash of Clans - I wouldn't want to meet this lot down a dark alley late at night.
Cut the Rope - This one's from the official Zeptolab channel, and is completely adorable.
Surgeon Simulator - Another official vid, but significantly less adorable.
Candy Crush Saga - I was actually a bit freaked out after watching this one.
Pou - Man, can you imagine if this was real? Best. Pet. Ever.
Fruit Ninja - Apples? Check. Slicing? Check. Dubstep soundtrack? CHECK CHECK CHECK.