I'll start:
Necro tank.....big mob coming from a newly taken resource...I know I'm just gonna get slaughtered.  So instead of fighting or fleeing, I use the /sitchair emote right there on the spot.  The entire mob circled me....and then just left.  I can't image what they were thinking 

Several times in Cyro I've come upon the remnants of a battle, with just two of the opposing sides left.  It's clear, that this has now become a dual between each player.  Several of the 3 alliances circled round...and we all just watched.  At the end of the fight, clapping, then we all just dispersed...pretty cool.