I've ran into the same problem several times and usually just telling them that they've already had balloons and some others haven't so I need to make balloons for the others first, they usually back off and will go to the back of the line. I also will calmly tell them that because they keep popping them it's obvious they don't like the balloons I made and I've ran out of ideas. Then they usually take the last one (which I tell them is the very last one) and they go on their way.
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