Just found this gem with Fiddlesticks and Yi.
I decided to randomly cast my q on a yi, thinking that it wouldn't do anything (because he's immune to slows), but it actually makes him run really fast the other way. This actually saved my team on multiple occasions, because this Yi was doing extremely well vs us, and I was the only one that could actually stop his reign of terror.
Sorry about the laggy gif, slow motion + spectator lag is not a fun thing.
Nope nope nope nope nopenopenope.
is Yi's natural counter, but surprised that YI jumped in first knowing Yasuo, Diana and FS is around. I hope your team won it.