... because his dad is a big eedjit

He sucked out the content of his helium balloon, the one that stopped flying three days ago.
He said that it would produce a rather hilarious Merry Melodies cartoons voice.

It didn't.

And after that the balloon was well and truly destroyed.
With no hope of ever flying again. Ever.

A "happy 70th birthday" balloon was hastily produced and inflated and in a matter of 45 seconds all was well again in the world.

Finn is five, you still have years of entertainment ahead of you Jay ...