The Bomb Range (aka testing stuff out)

Not to mention it makes my computer lag really hard. I think Nocturne's ult does the same thing, although obviously it only happens every 5 minutes or so.

This was a huge problem previously with Corki's valkyrie.

In fact, I had a whole set up of level 1 teamfights with valkyrie based on lagging the enemies with mundo's W and Lee sin's E when you could double tempest.