Lets's be honest who doesn't roam around on the daily with the internal dialogue towards people screaming :

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Everybody has an opinion or a complaint or a story these days. Now that can be because one needs to be center of attention or they just don't realize they don't SHUT UP!
Then there are the introverts who quietly huddle away their thoughts and prefect the art of silence.

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Can you imagine what some of these people may have to say if others would just take a momentary vow of silence?
Redditor wanderland_ asked the public that exact question.
Someone is a fan of "The Shining."
Just whisper "behind you." Rocketdude720

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Oh the healers.
Please everyone! Raise your hands! Lend me your energy! Neefew
There are so many languages to be discovered.
I would just say random gibberish for 20 seconds. After that people will be on the internet formulating conspiracy theories on what that sound might have been that everyone heard, it would be fun to see what people think. scythentic

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Mr. President is that you?
COVFEFE! beerdude26
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Always make a point.
Gee, sure is quiet. InvasionOfTheLlamas
May the force be with you.
People of Earth, your attention, please. This is Prostetnic Vogon Jeltz of the Galactic Hyperspace Planning Council. As you will no doubt be aware, the plans for development of the outlying regions of the Galaxy require the building of a hyperspatial express route through your star system. And regrettably, your planet is one of those scheduled for demolition. The process will take slightly less than two of your Earth minutes. Thank you. curtdammit

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There is always an opportunity for a buck.
Send 100$ via PayPal or venmo to (my info) for the answer to life's greatest questions. CumingLinguist
Music is so calming.
I'd sing the lyrics to Blue by Eiffel 65 as fast as I can, to see if I could fit it all into 20 seconds. Pinhead___Larry
Have it your way.
I'll have two number 9s, a number 9 large, a number 6 with extra dip, a number 7, two number 45s, one with cheese, and a large soda. did you hear that mcdonald? I want that. ReichMein
Good to be sure they can hear you!
Hey there, yeah you, yes you, I am talking to you. leaftey

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That's foreboding.
You have 1 year. pochiranpo

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Let's throw down.
SHOW ME WHAT YOU GOT! HereForYaMooony

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Such unparalleled wisdom.
The world won't change with pretty words alone. Is what I would say, and bathe in the irony of it. Ninjaflipp
Say it with photos.
SEND NUDES. Sibraxlis
Sing out Louise!
I've paid my dues
Time after time.
I've done my sentence
But committed no crime.
And bad mistakes
I've made a few.
I've had my share of sand kicked in my face
But I've come through.
And I need just go on and on, and on, and on
And then the whole world would sing the chorus in unison and it would be amazing. another30yovirgin

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Now we're talking.
I wouldnt. Some quiet would be nice. sivad0313
Spoiler alert!
Bruce Willis is a ghost. Willbert07

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AWWWWW...
All you need is love. pwampos
We're listening Lord.
This is your God speaking: Start being way nicer to those less fortunate or you will burn in VIP Hell. Also, I am pro-choice and fine with the homosexuals. SendBoobJobFunds
Britney brings us together.
It's Britney, bitch. alesthesia

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H/T : Reddit, wanderland_