Bog
A tsunami can't resist the call of a bog. Whenever a tsunami is headed toward land, a bog will always call out to it, "Hey tsunami, don't you want to hit me with your water? Come this way~"
Close your eyes and hear the bog's tempting call.
しょう
ぬま
None
As you listen to the bog's call you realize it looks just like the Numa (ぬま) Numa guy in your mind. You open your eyes and it's just a bog. You close your eyes, and there he is. The Numa Numa guy.
So that's what happened to him! If you're a youngun, just do a little Google and you'll be pretty pleased, I'm sure.