In two or three different games today, all the players in the game suddenly experience a ping of about 600-1000 (800 most of the time) at the exact same time. (everyone started complaining about lag, pinging thier ping, ect) Watching everyone miss skill shots for a while was hilarious.
In the first game it was ascension, it wore off after a while fortunately. The second game was summoners rift, where the lag pretty much persisted throughout the rest of the game.
The interesting part is that all players seemed to have the same ping, regardless of their normal ping. (I usually get 300 ping normally, but people from Europe and maybe america would have the same ping as me)
I have no idea how to reproduce this, I don't think there were any similar champs between the two games. (Well, maybe vayne?)