Forget about editing comments, I want collapsable threads

We've all seen the fanboy fights and other endless discussions that result from some posts/ articles (aka 300+ comments in the first hour on most apple-related posts).

So I'd really like collapsable threads, where, when something is going on for really long, we can just hit a little minus and get on to the next thread instead of scrolling for ages, a la reddit.

Thoughts?