Aden's Pearls of Wisdom

I was recently mulling over one of children's great unanswered questions, namely, where do grown-ups keep disappearing to? It used to happen quite regularly to me when I was younger, grown-ups would come right up to you, say the magic word "Heidi", wave their hands and bam! disappear into thin air, only to magically re-appear moments later with the magic word "peep-oh" Where on earth do they go? do they move into a sideways parallel world briefly? or into an alternative dimension? or is it some sort of hypnotism? I think it's high time we kids were told