-big/small head code
-big/small hand code
-big/small feet code
-giant mode code
-tiny mode code
-fast code
-moon jump code
-everything slow motion code
-insta killed code (instantly kills you because why not?)
-erase your save file code(you enter to many codes you get punished!)
-washingmachine code
-toilet code( all the yes! please let this be a thing XD )
-realistic bear & bird code (no copyright problems hear

-invisible code (whered you go?)
-reverse music code (game music plays in reverse) as well as a fast/slow music code
-butt code (replaces some dialogue with the word butt ;P )
-different type of film & filter effects codes
-squeaky shoes code (every step you take makes a squeak!)
-totally not "drunk or high" mode code (add the drunk or high effect from GTA or saints row)
-smooth mcgroove mode code (replaces all soundeffects & music with smooth mcgrooves version) [can be a kickstarter goal? lol

i know a lot of these are out there but im just having fun with ideas i had XD what are some of your ideas for codes?