Kai and Ian at the Thomas & Friend Live on Stage show recently.
Kai is fanatical about Toad the brake van (from Thomas & Friend) now. I don't know why. Toad is not a main character and he's named after an amphibian. But these days, Kai insists on watching the episode of Thomas & Friends with Toad in it. Every time I play it, he'd insist on watching the same episode again and again and again and again and again... It's very tiring for the accompanying adult.
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Here's why Toad the brake van is called Toad: According to the Wikipedia entry, his name comes from the fact that, on the Great Western Railway, brake vans were known by the telegraph code "Toad".