How do/Can you make Lakitu fly away?

I've played some levels where a Lakitu appears, throws some stuff at you, and flies away at a certain point in the level. I'd love to incorporate Lakitus more (I just love lakitus) but they're mostly ruined by leaving behind clouds that too often let the player cheese the level.

Still, I'd love to find a way to have them appear at a certain point, and fly away at another. How can this be done? I know I've seen it. I have some great levels where running away from Lakitu is the point, but it'd be made better if he'd bounce out on his own without me having to use a pipe or a door to switch sub-levels.