Well, it all started when, on live television, he took his silver medal he had just been awarded as team captain at the WJC and indiscriminately tossed it over the boards and into the stands.
Then it continued with his general performance on the Rangers, and the fact he basically quit the team in the minors and asked the Rangers to go back home to Sweden.
It then came out that he was depressed (or if you don't like that word, pick your own synonym), using sleeping pills, and basically not mentally functioning, all of which he discussed publicly in Sweden. Link.
As Kings fans, we certainly hope he'll eventually come back over to the NHL at 100% and be ready to succeed, but the kid has demonstrated a real pattern of emotional difficulties. We'll see what happens.
That video cut out just when it was about to get good. Ferraro was gearing up to lose his shit.