A bottle of perfume with the fragrance of the x86/x86_64 instruction set.

perfume.c

         char main
         [/*x86*/]
       __attribute__
    ((section(".text"))
   )="WTYH)9Zj8_j7H)9]R"
  "H)9^\350\0\0\0\0H)1^R"
   "H))Z8<2u\366j<)9Xj9"
   ")9j9VY)<$[S_H\xbd^["
    "H$@\xcd\200-XP\xf"
    "\5XP_j<W\xeb\xe2]"
     "Hello World!\n";
      /*Linux_Only!*/

Here's what this code does (but using syscalls, not stdlib):

  const char *m = "Hello World!\n";
  fwrite(m, 1, strlen(m), stdout);
  exit(0);

So you can change the message at the end of the "main" string and it will be printed.