Never Talk to Strangers

Another book I liked and had read to me as a kid is Never Talk to Strangers by Irma Joyce with very 60's-esque illustrations by George Buckett. Many situations in which children might find themselves encountering a stranger are presented and always followed with the advice: "Never talk to strangers."

For example:

"If you're mailing a letter to Aunt Lucille, and you see a car with a whale at the wheel, stay away from him and his automobile. Never talk to strangers."

The book is copyrighted 1967.