Of course, John Frum doesn't use a shell Himself, as you can see from this photograph of Him. And He drinks a LOT of kava.
In fact, ALL kava ultimately comes from that cup. Details below.
Long Ago
When the World was New
And Men first walked upon the lands
John Frum flew over Tanna
In the Airplane of Our Ancestors
He saw there was much quarrelsomeness
Brother fought with brother
Sister fought with sister
Husbands quarreled with wives
And John Frum was sad
Everywhere, there were arguments
Everywhere, there was shouting
And John Frum picked up his cup of Shut The Fuck Up
And he poured it over Tanna
And where it poured on the ground, the sacred Kava grew
And when the men drank the kava, they became quiet
And they listened to the song of the kava
And they listened to the voice of the ancestors
And they listened to the hearts of their brothers
And they listened to the hearts of their sisters
And they listened to the hearts of their wives
And the more they drunk, the more they shut the fuck up
And the more they shut the fuck up, the more their minds were opened
And the more they shut the fuck up, the more their hearts were opened
And John Frum was glad
For the farmers planted more kava
So that all the people would drink of the kava
And they would shut the fuck up
And the people of Vanuatu did grow kava
And the people of other islands did grow kava
In Melanesia, kava was grown
In Micronesia, kava was grown
In Polynesia, kava was grown
And John Frum was glad
And his brother Philip was glad
And Philip's Wife Elizabeth II was glad
For all around the world, the kava was drunk
And everywhere the kava was drunk, the people did shut the fuck up
So Sayeth John Frum