Cinnamon Challenge
From OAPedia.com
The Cinnamon Challenge is a stunt where someone attempts to swallow an entire tablespoon of ground cinnamon without drinking water. Opie and Anthony found out about this stunt and had E-Rock try the same thing on December 11, 2007. E-Rock nearly (unfortunately) choked to death as a result. Afterward, O&A felt obligated to do a public service announcement telling people not to try this at home (because after all, dead listeners means dead show).