Bongo is riding on the handrail of the moving sidewalk in the airport.  It bumbled a little as it moved and joggled his beans.  It felt funny.

Bongo wondered where the floor and the handrail went when it disappeared at the end.  Then he realised that the pieces went back to the beginning by going the other way on the OTHER moving sidewalk.

THEN, he saw one that was working and the one next to it that was NOT!  How did the pieces get back to the start?

It was very confusing to Bongo.