My biggest fear is balloons.
I have a fear of balloons but not just looking at them, No No No. When they pop, fly away, or if I touch them that is what triggers my fear. At birthday parties I stay away from them and never have any at my own.
Yes this does happen it’s a cycle
The biggest city in the world is actually Tokyo in Japan, but it depends which aspects in your question you are looking for.
In terms of population, Tokyo.
In terms of land mass, New York, USA.