How Bee lost his voice:

[Megatron is standing uncomfortably close to Bee]

Bumblebee: Um, so. Can I help you?

Megatron: No. But maybe I can help you.

Bumblebee: Um, I need an adult.

Megatron: I am an adult.

[Meatron destroys Bee's voicebox]

Megatron: By the way I only hit you because I have pent up aggression towards your sire. So take that. [Flies away]

Source: Dragon Ball Z abridged

Submitted by: thiger