One year (2022) I could see, on an early problem (day 2), that I could define a handful of words in forth such that I could execute the (modified) input file itself as code (there were only 9 possible combinations since it was rock-scissor-paper, although I did have to alter the input by removing the spaces first, like "A X" was changed to "AX") to get the answer. I defined words that matches the 9 inputs and had those do whatever the problem said to do. https://adventofcode.com/2022/day/2

That's a great idea!