How complex can you make your Hello World program? [closed]

Question

How complex can you get your Hello World code to be? From a simple cout, to a super intelligent AI, how creative can you get? Unleash your creativity!

Rules:

NO RULES. Go wild. Even machine code is fine.

Answer 1

You will find great samples in any of the so called "Esoteric Programming Languages":
http://en.wikipedia.org/wiki/Esoteric_programming_language
e.g.: LOLCODE:

HAI
CAN HAS STDIO?
VISIBLE "HAI WORLD!"
KTHXBYE

Answer 2

C-x M-c M-butterfly

Answer 3

echo "3e25960a79dbc69b674cd4ec67a72c62"

Answer 4

This is a brainfcuk code:

++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.