Theories:

1. They all live in boy-in-the-bubble style clear plastic balls.
2. They are all related and suffer from genetically small ears and large mutant vocals chords.
3. They are addicted to a constant supply of toast and can’t hear each other over their munching.
4. Their lips are shaped like cone shaped loud-speakers.
5. Their religion admonishes any mild subtlety in vocal range.
6. They’re just total and utter arsetastic muppets.
7. They all suffer from crippling inferiority complexes stemming from a fear of other people not hearing their point.
8. They have underfloor heating and somebody dropped a box of unpopped industrial grade popcorn on the floor.