Sometimes, I simply do not comprehend any of the goings-on (shaking head in utter bewilderment e) 'Poi' especially is sailing over my head.

Faldage's link suggested that the greek 'potamos' is the root for both Mesopotamia and the adorable hippo. Does that apply also to the Potomac?

Edit:
[shining bulb e]

potare(L): Potable, Potatory, Potation
potamos(G): Mesopotamia, Hippopotamus
potio(L): Potion, Poison
posis(G): Symposium

Phew!