It happened during a show called PFT (Pro Football Today) Live. NBC Sports host Michael Holley was in the middle of a conversation with co-host Mike Florio, when the veteran announcer suddenly started to sway visibly on camera. 

But it's his wide-open almost googly-like eyes that may be the one thing I'll never forget. It was downright creepy. 

The NBC personality apparently needed some stiches to repair a cut when he fell off his chair, but was otherwise OK. He later explained the room he was in was extremely hot and he'd neglected to eat or drink anything before going on air, leading to his collapse. 

NBC has not rebroadcast it, but that didn't stop the Internet from capturing the odd scene. You can see it here.