Pictures:

What is a happy insect called?

An uptick.

3135

How do we always know who a child's mother is?

When she is pregnant and gives birth, it's apparent.

2614

What is the difference between being united and being untied.

Getting 'it' backwards.

85

How we do know that the thumb is the strongest finger?

It's a rule of thumb.

1447

When everyone quit the baseball league except Joe, why wasn't Joe upset?

Because now he was in a league all by himself.

2401

What does an audio engineer do?

Provide sound advice.

1389

When submarines do naval exercises, what are they called?

Sub routines.

2400

In what room of a school are things re-created?

In the recreation room.

1666

How did the the drunkard summarize his drinking binge?

With a short schnapsis

181

Where can you buy black markers?

The black market.

3153

Why didn't ancient man understand the world of the stars?

It was over his head.

2110

Which doctor is best to oversee your knee surgery?

The Joint Chief of Staff

186