Realizing that you can see when gym battles are taking place live by the effects just made for one of the coolest things I've ever seen in a game.
I was watching in real time as, for about an hour and a half, three gyms within range of me were going nuts in some kind of turf war, which I may have only seen the edge of. It started possibly with some Instinct player moving west and trying to at least damage as many enemy gyms as possible, then, like, counter attacks were happening, then reinforcements in the form of training the prestige back up to shore up losses or dig into a newly acquired gym, then three gyms were lighting up at once, then all of a sudden two Valor players just sweep in and work together to reclaim a gym stolen by Instinct, and by the end of the night what was this morning a solid block of high level blue with a tiny bit of yellow is now two feeble blue gyms that could easily be taken out and a single red separating them.
This was all happening like within a few blocks or less frome me. One was just around the corner.
God that was cool.