[Retr0spectrum]

​Edit: https://xkcd.com/1627/

[tragic]

I'm assuming it's the sound a joke makes when it goes over one's head.

[oneeyedpigeon]

There needs to be an xkcd about editing a comment such that old replies to it no longer make sense. I couldn't find one, though.

[slaman]

he had one but he edited it.