How can I initialize an Array inside a Hash in Ruby

I am trying to initialize a Hash of Arrays such as

@my_hash = Hash.new(Array.new)

so that I can:

@my_hash["hello"].push("in the street")
=> ["in the street"]
@my_hash["hello"].push("at home")
=> ["in the street", "at home"]
@my_hash["hello"]
=>["in the street", "at home"]

The problem is that any new hash key also return ["in the street", "at home"]

@my_hash["bye"]
=> ["in the street", "at home"]
@my_hash["xxx"]
=> ["in the street", "at home"]

!!!???

What am I doing wrong what would be the correct way to initialize a Hash of Arrays?