Pareidolia

One day, it seemed, the clouds in the sky above New South Wales spelt out the words 'Hello. Its me' to hundreds of spectators.
The next day, it was dismissed by the scientific community as pareidolia or "a psychological phenomenon in which the mind responds to a stimulus by perceiving a familiar pattern where none exists".

Following that a  flower was discovered in the Amazon with the words "I said hello", apparently within its design.

"Pareidolia", said the scientific community again, ignoring it.

A flock of starlings were observed over Ontario, to form the words, "Look. I'm only going to say this one more time".

Pareidolia, the scientific community concurred.

"Why don't you ever listen?" was seen in the woodgrain of a newly sawn tree in Norway.

"Pareidolia", repeated the scientists.

But the people couldn't hear the noise the scientific community was making anymore for now they had started listening to Universe's words.