Lateral puzzles are best done in a group. One person reads the puzzle, and then others ask questions requiring only a YES/NO answer. Like brainstorming, one person's question will often trigger another's thought patterns to veer off on a tangent not considered before (thus "lateral" thinking). Sometimes it takes a few samples to get folks to start thinking outside the box.
Some might remember the puzzle from the Cosby show about the accident victim taken to the ER. The attending physician refuses to treat him saying, "He's my son." All knew the doctor was not his father. ??????

The only hint I would give is that even feminists often flub this one.
I LOVE lateral thinking puzzles and so does my husband. We sometimes use them on long trips, especially with the grandchildren. ( )

Small but well-organized collection of puzzles. Good for both beginning and expert lateral thinkers.