There are real (in the sense they compile in actual C++ compilers people use and the resulting executable will run) toy (ie not intended for production use) examples where you can cause the compiler to conclude that executing this never-called function named format_hard_disk or begin_world_war_iii or whatever is the only remaining possible meaning of the program so that's what happens when it's run.

Nobody has written an actual format-hard-disk or start-world-war-III routine, because we're not crazy, but the alarming function naming is intended to signal what a terrible idea it is to have this programming language at all.