TP Ashe...
I know that it isn't something that you SHOULD do, but it is fun to do, especially if you can time the ult and TP right. I get some flack for it, and frankly I am a crappy ADC, but because Ashe's ult is the only global CC in the game and because its cc scales with the distance traveled (to a limit), it is fun to ult the enemy carry that is going at it on your tower, and show up to take advantage of the 3 seconds of uninterrupted arrows. Now, the thing is, its only useful if someone is attacking your tower because people don't USUALLY move during that, as well as the fact that you have the WHOLE area between towers to chase down your target with the remaining slivr of hp left...