Reminds me of the time I got really intoxicated and started playing 'Regen Tag' on the spur of the moment with someone in Limsa and we had a blast. I wish I knew who it was, might have been a friends list person, but we were running through the city wreaking havoc using line of sight behind objects and jumping just into and out of range to try and break each other's casts.

It's actually good PVP practice since they're non-detrimental effects you can cast on non party members. Regen is easy to get off of course, if I was going to score it I'd perhaps do something like 1 point for a successful Regen landng, and 5 points for a successful Stoneskin cast since it's not an Instant.