Link of the day: List of Things that are Accidentally Turing-Complete
A machine that is Turing-complete can in principle execute every conceivable computer program (I leave the detailed explanation to Wikipedia). Some things are designed to be Turing-complete (programming languages), others are not (Pokemon Yellow Edition, Super Mario, MS PowerPoint). And the latter are decisively more funny. Check it out, if you’re interested. Also look at this hilarious 5min video of someone programming software with PowerPoint!