Answer:
I am the ultimate killing machine used not once but TWICE I can be made by humans.
If two's company and three's a crowd what are four and five?
Why is it so easy to weigh fish?
Some people avoid me some people count me some people just consume me
How many letters are there in the English alphabet?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?