Cam is dipping a grilled cheese sandwich into a bowl of tomato soup when he feels the summons. He goes ahead and grabs it. Doesn't even drop the sandwich.
"Let's see, what all did I list -" He pulls out his computer and writes down the ones he can remember. "Azkaban is a fictional prison island from an excellent series of children's books. It is guarded by nasty soul-eating monsters whose mere presence causes crippling depression and the loss of all happy memories, very unpleasant."
"Sure. On that note, R'lyeh is a sunken city in which the 'old god' Cthulhu is stated to lie dreaming. Horror series."
"Two of the big monsters in Terraria, the really tough ones that only show up under specific circumstances, are called the Eye of Cthulhu and the Brain of Cthulhu. I really don't want to meet the Rest of Cthulhu."
"I have no explanation for Cthulhu, believe me. Anyway, call me superstitious, but I don't want to name any islands R'lyeh."
"Númenor's an island from the world of Middle Earth. I don't remember much of the history of it besides the name, it's been at least twenty years since I re-read the books. Lilliput has little tiny people on it who are alarmed to encounter a normal-sized visitor and overpower him with great numbers and tie him up. Oz is a magical land divided into four parts, one of which at the time the first book opens is ruled by a wicked witch who is dispatched by the little girl who is the protagonist and her friends. Myst is a video game and the eponymous island is full of puzzles. Wiaam is a sky-island inhabited by leftover technology from a lost civilization. Yüa is an island most notable for being made entirely of angelic cloud-fluff despite being located - both canonically, and after the movie became popular - in Hell. Metza-pa is a sci-fi island on Mars used as a political test site for various ideas the author likes to illustrate that way."
Cam makes a little puff of it. "Heaven's made of it until the angels carve caves out of it to live in," he says, handing it over. "It's interesting stuff."
"Of course. Of course there is such a thing as a 'cloud block'. Which is like that. But squishier."
"I think I'm forgetting some islands, but since I have forgotten them, I cannot fill myself in. Eh."