The angry bird is literally "#pragma twice" – a beautifully cursed play on C/C++ preprocessor directives. Instead of the standard #pragma once that prevents header files from being included multiple times, someone decided to go full chaos mode and declare #pragma twice . This would theoretically ensure your header gets included exactly two times, doubling all your definitions, creating duplicate symbol errors, and generally making the linker lose its mind. It's the programming equivalent of "I want my problems in stereo." The angry bird's expression perfectly captures the rage of any compiler trying to process this abomination, or the developer who has to debug why everything is defined twice. Fun fact: #pragma once is actually a non-standard but widely supported directive that's cleaner than traditional include guards, but #pragma twice ? That's just asking for trouble with extra steps.