I'll slice you open like an envelope - Saying this means you're so angry, you'd rather stab someone

Saying this means you're so angry, you'd rather stab someone than eat a sandwich. You're not even trying anymore.

He said, "I'll slice you open like an envelope," then tried to punch my friend.

At the bus stop, she said, "I'll slice you open like an envelope," and then threw my backpack in the dirt.

During the game, he said, "I'll slice you open like an envelope," and then ran off like a coward.