The Development of a Threat

A threat normally starts out as something simple such as, "I WILL CRUSH YOUR BONES!"
Then you add more and more too it in order make it sound more ominous.

"I WILL CRUSH YOUR BONES!"
Turns into
"I WILL CRUSH YOUR BONES TO DUST!"
Turns into
"I WILL CRUSH YOUR BONES TO DUST AND BAKE THEM INTO BREAD!"
Turns into
"I WILL CRUSH YOUR BONES TO DUST! BAKE THEM INTO BREAD! AND FEED IT TO YOU!"
An now you have a decent threat. Now, all you have to do is say it like you mean it!

If done properly, by the time you finish saying that last statement, your opponent will likely be running in the opposite direction screaming like a guy that's screaming like a little girl.