what would happen if every person on Earth screamed at once how loud or even destructive would this be well the average scream is 90 DB loud but a trained voice can shatter glass at over 100 debl and in 2014 75,000 screaming fans broke the record for loudest crowd at 142 DB which is louder than standing next to a jet engine so with 8 billion screams we’d reach 180 DB instantly rupturing our eard drums and feeling as if we got hit by a wall of air but overall it wouldn’t cause mass destruction ju