When the Williams family decided to get a swimming pool, everyone was so excited. Dad set up the pool, Mom hooked up the hose, and Junior placed it in the pool. While they were waiting for the pool to fill, they decided to go for an ice cream cone. On the way to the ice cream shop they stopped to chat with their neighbors the Smiths. An hour later someone remembered the pool. Panicked, they drove home without their ice cream, fearing the worst. What's so funny?

What one thing can always bring everyone down?

What is always coming up, as it is always going down?

What four letters can bring more people to a halt than any others?