Whitespace [0], where whitespace is the cause of, and solution to, all of your problems.

[0] https://en.wikipedia.org/wiki/Whitespace_(programming_langua...

I have my editor set to expand tabs to spaces. It plays havoc with Whitespace programs.

Leaves all the comments intact, though.

In university our classes required us to make a printout of our code to submit. My friends and I had a running joke that we'd hand in a stack of blank pages and claim we solved the problem in Whitespace :)