Superbowl?

I've always thought that this connection was between the venue (i.e., classical-style amphitheater) and a punch bowl. A quick look at its etymology (from Old English bolla 'bowl') shows that heads come into play: Old English heáfod-bolla 'skull' (used as translation of Golgotha, Calvary, heáfodbollan stówe), Middle High German hirn-bolle, Old High German hirni-polla 'brain-pan, skull'. Good call, Branshea.

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Ceci n'est pas un seing.