Two things:

1. I wish more HN posts ended in "for fun" -- so much of what makes being a progammer fun and enjoyable is plumbing the depths of what is possible, not because it's "best practice" or whatever. I think these types of forrays are where true mastery comes from.

2. The less reserved keywords a language has, the better. It makes things like this easier. Years ago I figured out how to implement Goto in Smalltalk "for fun". It was easier because Smalltalk had less reserved keywords.