Answer:
What always goes to bed with its shoes on?
I am an odd number. Take away a letter and I become even. What number am I?
I am the word that has three syllables and twenty six letters.
I am a cave full of bones and the house of a worm.
I am the ultimate killing machine used not once but TWICE I can be made by humans.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.