Here are mine: (list will almost certainly be updated as I remember other stuff)
1. During the Battle of Krustallos, I had some Rahkshi ambush Trantoshen and a squad of Malchiorians he was leading. That remains my favourite RPG fight scene ever, even though it was pretty short and involved mainly nameless mooks.
2. During the Collapse arc, which was erased by BZP's Time Slip, Blackout built a Kill Sat and invited lots of people to the unveiling, including Zev. Everyone had to be checked for weapons before entering. Zev was asked to hand over all his weapons, and proceeded to bury the poor Rahkshi guard in knives.
3. Another one from the Collapse arc-that-never-was. Malygos invited Blackout and Ynot to a banquet, and Blackout was making all sorts of hilarious attempts to assassinate Ynot, including spraying his armour with corrosive acid while he was in the restroom. (Why a Makuta needed to go to the restroom remains a mystery. )