DF zombies.

[Teslo]

This.

But also in FFXI, i had random parties going on for 4 hours without saying a word, except
brb, re, wb.
people knew their job and wanted to get XP - end of story.

I think, at least for Expert Roulette there should be an option to go with people from the same server;
maybe there's more willingness for smalltalk when you know the conversation does not have to end with the dungeon,
and that you could actually do something again with those people.

I like seeing people from my server pop up in a DF. I always try to strike up a conversation with them (Unless they're someone I've seen making stupid comments, or have an overly stupid name. haha <.<; ).

When its unlikely you're to see that person again, I don't see the point in getting friendly.

I've made friends cross-server. It's unlikely that I'll ever see them again, and even if I do I might not remember who they are. But it's always nice when it happens! Comments like "You/You guys are awesome, what server are you on?" always make my day.