Answer:
I give people a huge fright, but at the end I'm sweet. I normally celebrate at night, when there's less heat. What am I?
In many hall ways you would stand if not with me in hand.
I help engines spin and pants stay up. What am I?
I am a certain five-letter word and become shorter when you add two letters to me. What am I?
The more of this there is the less you see. What is it?
I am your mother's brother's only brother in law. Who am I?