Answer:
What bone has a sense of humor?
When I live I cry if you don't kill me I'll die.
The time between daylight and darkness when blood drinkers like to come out
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I belong to everyone. Sometimes make you happy, sometimes make you sad. I will never end until the day you do. What am I?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?