Last Riddle in May

Thirty men with ladies, two,
Standing around with nothing to do,
Dressed in formal, black and white,
Yet when they move it begins a fight.

What is it?

Just a Riddle

Old as the dinosaurs am I.
A vampire by nature,
Killing thousands during my time.
I have no wings,
But can jump very high.
Tell me oh tell me,
What am I?

Ok, here is a hint: I'm a very tiny creature.

Weird Riddle

When you are sad
You tear out my insides
When I am finished
You crush my outsides
You choose my insides
Whatever feels good
Picking out my outsides
Thinking about yourself

What am I?

A Fine Day to Riddle

I'm never there when you need me,
For me you'll have to wait,

I'll provide a wealth of knowledge,
But always just too late,

What am I?

"May" I Riddle?

Placed above it makes greater things small.
Placed beside it makes small things greater.
In matters that count it always comes first.
Where others increase it keeps all things the same.

What is it?