Best idea ever

I see no problem with this idea.

These guys are full of hot air

Looks quite like how an exibit hall at a children's museum would be decorated.

Now I want to do this is the hallway of the hotel I'm staying at...

It looks Like willy Wonka and the chocolate factory

What happens when it deflates?

You might burn something, though.

Why not?

Where did you randomly get a hot air ballon

WHERE DID YOU EVEN GET A HOT AIR BALLOON?

Aren't hot air balloons inflated with fire? And you all are drunk? I can't wait to read the police report.

I want friends like this