Pro tip: changing stars into birds in Mega Man 2

In Mega Man 2 when you select your favorite Robot Master, they stand in the middle of the screen and do an Action Pose(tm) in the middle of a field of stars.

But!

If you hold down A + B + Select, then hold Start, you get a surprise

The stars have been replaced by the little bird-things that plague you throughout a couple of the stages.

What's the point?

Nothing, as far as I can tell.