Puppies

 What do you call a puppy with a fever?

A hot dog.

Sewers

 Why do sewers make terrible runners?

They always have a stitch in their side.

Weather/Climate

 What's the difference between weather and climate?

You can't weather a tree, but you can climate.

Days of the Week

 What are the strongest days of the week?

Saturday and Sunday. The rest are weak-days.

Airplanes

 Why do airplanes make bad spouses?

They're always ready to take off.

Bogs

 What's a bog's favorite sweet treat?

Marsh-mallows.

Mike Tyson

 What is Mike Tyson's favorite bowl?

The punch bowl.

Roman Numerals

 How do you add one to ten to get nine?

Roman numerals, IX.

Hotels

 What do you call a hotel with really bad customer service?

A hostile.