The 'Illegal Minecraft Building Techniques' meme refers to a collection of 'cursed' images that showcase impossible physics or non-existent items within the sandbox game Minecraft. It gained traction across Reddit and Twitter, often featuring modded blocks like vertical slabs, circles, or items that defy the game's strict grid-based logic. These memes typically pair a confusing screenshot with an over-the-top reaction from the FBI or a 'Wait, That's Illegal' caption. The humor lies in the visceral reaction veteran players have to seeing the game's fundamental rules broken, highlighting the community's long-standing desire for certain features and their amusement at the sheer 'wrongness' of glitched or modded visuals.