Prompted by this comic at Commit Strip.

Me? (Not that I'm an expert.) Because Perl was handy, extremely useful, and didn't require a separate compile phase. Because I could solve other people's problems with it. Because it was general purpose, and not specifically geared for stream picking / editing. Because it was free. Because it was more fun than any other language I knew at the time.

Quantum Mechanics: The dreams stuff is made of