QUESTION:  
About 10% of all adults admit that they are afraid of this, even though most kids love it; what is it? 

It comes in many different sizes and colors 

ANSWER:
Even though kids love them, about 10% of all adults admit that they are afraid of balloons (more specifically popping a balloon). 
 

Congratulations to Kim Vaughn of Centerville for being the first to answer the Impossible Question!