1. Three mature and hefty women were walking in San Fransico under one regular-sized umbrellea. Why didn't they get wet?
2. What can a pitcher be filled with so that it is lighter than when it is filled with air?
3. What occurs once in a minute, twice in a week, and once in a year?
4. A man traveling in a taxi and is talking to the driver. After a while the driver tells him, " You must excuse me, I am deaf and cannot hear a word that you are saying. The passanger stops talking. After the passanger gets out of the cab, he realizes that the driver had lied to him. How did he know?