Anyone ever play multiple MMOs at once?

One of my favourite parties I can still remember was PLD(me) - DRK(my best friend) - RDM - WHM - BLM - BLM. We were fighting crabs in Kuftal and double MBing Freeze AM off the SC set up by PLD+DRK. A LS mate of mine was also in Kuftal in another party and once he saw how our party was operating, he kept asking me to let him know if a spot opened up. IIRC the RDM was throwing some MBs in there as well (WTF else was he doing aside from refresh? lol).