This article is from the PEZ candy and PEZ dispensers FAQ, by sharpe@dg-rtp.dg.com (Chris Sharpe) with numerous contributions by others.
These tabs are often called "thumb tabs" on the Pezheads mailing list
because they were first thought to be a place for the thumb to assist
in opening tall or oddly shaped heads. Actually, the factory added
this tab to newer molds so the dispenser will lie down on its "back"
without rolling over on its side when travelling on conveyor belts.
The feet at the bottom and this new tab on the head keep the dispenser
from rolling over on its side.
 
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