We bought a helium tank and balloons to inflate for Lacy's birthday party. Lacy was going to release one outside, but I told her it wasn't a good idea.
"When the balloon flies into the sky, it will pop and land in the water. Then a fish will eat it and die!"
Lacy accidentally let a balloon out of the house a minute ago. She was visibly upset. "Daddy! Oh no! The balloon's gone! It's going to go eat a fish!"