Riddle:

A man goes out drinking every night, returning to his home in the wee hours of every morning. No matter how much he drinks, he never gets a hangover. This drink is very well known, but is rarely consumed, served warm and taken straight from its source. The man is a sucker for a free drink, especially since he can't live without it. What is his favorite drink?

Blood, he's a vampire!

Riddle:

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A hole.

Riddle:

Take one out and scratch my head, I am now black but once was red. What am I?

A Match.

Riddle:

What gets wetter the more it dries?

A towel.

Riddle:

What gets whiter the dirtier that it gets?

A chalkboard.

Riddle:

Which does not belong in this group: Apple, Grape, Banana, Cherry, Pear?

The Banana. It's the only one that needs peeling before eating.

Riddle:

Which word that begins with the letter I, and by adding the letter A, becomes another word that is pronounced the same?

Isle and Aisle.

Riddle:

Take two numbers, such that the square of the first, plus the square of the second, shall equal 8; while the first, plus the product of the first and second, shall equal 6.  What are the two numbers?

2 and 2.

Riddle:

What never gets any wetter, no matter how much it rains?

The sea.