All of the typical points that get mentioned are already here, so I'll go a bit off topic.
When I'm trying to look up info for something (for instance, The Space Shuttle Challenger disaster) I'll go to a messageboard, and instead of any useful info, It will be one post after another of people saying where they were when it happened, and how it affected them. Noone can seem to be able to think past themselves anymore, lol.
EDIT:, Shit, I just gave myself an idea on how to troll those rock song YouTube comments... I'll just comment on a completely unrelated disaster or incident (The JFK assassination for instance) where I was when it happened (I wasn't born yet) an how bad it made me feel (very, very bad indeed).