He has done 2 things so far that i have noticed.

1, like everyone is seeing he appears at his gravestone, floats and stares then goes away.
2, If you approach as Warwick in his URF skin, he will appear throw his spatula at you and then shake his head while floating away.

Here is a video. http://www.youtube.com/watch?v=gcbX6n6zpEI (Thanks to damxam(Also known as Dr.D) from the Dear Riot Clan for recording/editing)

Edit: Wooooooooooooooooooooow! I'd play Warwick just to see that every game...if I wasn't so terrible at playing him!

Serious?

pics or it didn't happen

Wait... what?

Yeah I heard on the Hallowing map that the Ghost Of Urf appears. That is all I know for now.

i will get you pics/video. brb.

wow.....nice!

Nah it's legit. Saw it on Youtube.

My team saw it! Then the other team came and killed us as we were looking at it...they didn't believe us when we said we saw it and we were distracted