Using a made-up language specifically designed for the challenge
This includes any language with commands that "do whatever I choose them to do""do whatever I choose them to do". Claiming that your answer is written in "MyOwnLanguage", where the command x
means "read a sequence of numbers, split them into groups of three, and print the last numbers of those groups where the second number is less than the first", was clever the first time it was done. That was a long time ago.