It's only a balloon
Balloons can be lots of fun.
They also are easily available and can be great to express feelings.
For example, if a child has had a bad day, ask them to blow up the balloon thinking about all the things that went wrong.
They can mention them with each new breath taken. Then let it go!! Wow it splatters everywhere and of course makes the appropriate sound.
Then you say..."problems are blown away into the air !"
Children can draw a sad face on the balloon before they let it go.
I have used this with younger children and they enjoy the experience of letting their sad feelings just blow away.