Donkey Kong Country (GBA) Easter Egg - Dk Has a New Roomate!

This egg will only work once, after you defeat the Gnawty in Gorilla Glaciers go back to DK's Treehouse in Kongo Jungle (the first area in the first level). Start the level, and when you pop out of the house go back in, you should find Very Gnawty the boss of Kongo Jungle inside: He turns around and notices you and runs out.

It only works on the GBA version, I've tried doing it 2 times but it only works once.