CNBC's Jeff Macke went progressively nuts on the air yesterday, beginning with a bizarre afternoon phone interview during which he rambled about Justin Timberlake and culminating with a 7 p.m. breakdown on CNBC Reports wherein he incoherently berated anchor Dennis Kneale. This isn't CNBC crazy—it's actually crazy.

CNBC executives are concerned about Macke's health, insiders say. He is in the midst of a contract dispute with the network right now, and CNBC has been strengthening its hand by limiting Macke's airtime in recent weeks, which seems to have increased the amount of stress he is under. After yesterday's bizarre outbursts, he won't likely be back on the air too soon. We hope he gets better!