This is a little too geeky for me, but... gotta love that "hello world" program.
Anyway, I decided that it would be amusing to inflict my obsession on you, my readers, with a new feature: the friday pathological programming language. You see, there are plenty of crazy people out there; and many of them like to invent programming languages. Some very small number of them try to design good languages and succeed; a much larger number try to design good languages and fail; and then there are the folks who design the languages I'm going to talk about. They're the ones who set out to design bizzare programming languages, and succeed brilliantly. They call them "esoteric" programming languages. I call them evil.
Today, the beautiful grand-daddy of the esoteric language family: the one, the only, the truly and deservedly infamous: Brainfuck!, designed by Urban Müller. (There are a number of different implementations available; just follow the link.)
Only 8 commands - including input and output - all written using symbols. And yet Turing complete; and not just Turing complete, but actually based on a real formal theoretical design. And it's even been implemented in hardware!
Here's a hello-world program
++++++++[>+++++++++<-]>.<+++++[>++++++<-]>-.+++++++..+++.<
++++++++[>>++++<<-]>>.<<++++[>------<-]>.<++++[>++++++<-]>
.+++.------.--------.>+.