When set loose I fly away. Never so cursed as when I go astray

You walk into a room with a rabbit holding a carrot, a pig eating slop, and a chimp holding a banana.Which animal in the room is the smartest?

You will always find me in package goods

With pointed fangs it sits in wait, With piercing force it doles out fate, Over bloodless victims proclaiming its might, Eternally joining in a single bite What is it?

Why was the math teacher late to work?