Alright, I've had 2 seriously cool megaevents.
1. The Jagged Knife appears, and takes 3 planets from each civ and has the combined techs of all involved. The only odd thing was that...we were at peace even tho the event described as something of an insurrection or rebellion.
2. Pirate swarms. Swarms! They murdered all my trade routes, all my lightly defended starbases and decimated my fledgling military! Woohoo for good pirates! Or bad pirates! Or whatever! Anyway, I thought it was cool, even tho they waxed me. Too bad they didn't make demands too... "Well...it'd be awful if you lost that trade route there...but I'm selling protection for trade routes for...oh...500BC..." I'm still digging that game out from the pirates.
Thanks for better pirates! Woohoo!
Anyone else have some cool mega events?