pineapple grenades ceased being used 50 years ago. they've been round ever since.

I'm not calling down fire from heaven on the show for this, I'm just making a note about how I find it humorous that it is used in hollywood still today.

A reason in this instance? it's easier to bite the pineapple grenade than a baseball grenade.

BTW, most islands are in the middle of the sea.
As the world is a waterworld with landmasses dotted everywhere there is no true "middle". it's all relative.