In a perfect world, chickens could cross the road without having their motivations questioned. But this isn’t a perfect world, and human beings are imperfect creatures. Hence people keep asking, “Why did the chicken cross the road?”

Yet what possible difference could it make, why an anonymous chicken crossed some unnamed road? Sherlock Holmes, in The Sign of Four, suggests a potential answer: “I cannot live without brain-work. What else is there to live for?”

And thus there are many books of riddles, but this isn’t one of them. What we have here is an intellectual party game—Explain This!—based on lateral thinking puzzles. (Details and rules are found below.) The game, which originated as an academic teaching tool during the 1960s, is designed to be fun for smart people. This book is written with the hope of being likewise amusing.

Brainteasers often take a generic form. The most dreaded variety starts out, “If a train leaves St. Louis traveling 60 miles per hour…,” at which point most people blurt back, “…how far is it to the bar car?”

Another common genre of riddles follows the “missionaries and cannibals” format, in which three missionaries and three cannibals must cross a river using a boat that can hold at most two people. At no time can there be more cannibals than missionaries on either shore (because they’d quite naturally, and perhaps deservedly, eat the missionaries), hence the challenge is how to sequence the crossings in order to get them all safely to the other side.

For those who feel that missionaries versus cannibals might sound politically incorrect, there’s a variation called “the jealous husbands.” That version substitutes three married couples, with the constraint being that no woman can be on either bank with another man unless her husband is also present.

And if that sounds even less politically correct, we can always fall back on the “What am I?” riddles from our childhood.

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The answer to the last one is bubble gum, and anyone who envisioned otherwise should drop all pretense of political correctness.