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The main reason they trap Debbie and the other girls in giant balloons is because they need them to help reproduce their dying race. They either have very few female klowns of their own or it could also be that the female klowns are unable to reproduce on their own. Another possible reason is to either study them, use them as entertainment, or to eat them! It has been said that the balloons are like refrigerators which help keep the victims fresh and alive for later use.
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