I wish I had been recording....

So for the first time in a long while, I decided to pop in my cartridge of Kirby's Avalanche and play it a bit. Since I thought I was rusty, I went for the "Practice" mode (which is really just playing with yourself endlessly). I picked the middle difficulty because I wasn't THAT out of shape.

So I play for a bit, make a few combos and...

... Okay, you know how Kirby is dancing around in that box in the middle of the screen? Well all the sudden KIRBY CLIMBED OUT OF THE BOX and REPLACED THE PUYOS, DROPPING INTO MY PLAYFIELD! I could control where he landed and everything, but when he landed all he did was walk off the side of the screen (walking THROUGH several puyos, including the stone ones) before instantly reappearing in his little box and continuing to dance as if nothing had happened.

So, what the hell? Did I somehow trigger an easter egg? Or is this a perfectly normal thing in Practice mode and I just never saw it because I don't play that mode much?

I swear I wasn't drunk or high when this happened.