Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

Surprise

2020-10-10 View on smbc-comics.com → 1 revision
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Surprise
Votey panel for Surprise
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Explanation

The Joke

A man tells his partner, "One day next week I am going to surprise you with sex. It's gonna be amaaaaazing." She responds that it can't be Saturday next week because of midnight, and it can't be Friday because by process of elimination knowing it isn't Saturday means it is coming Friday. Using this chain of logical deduction, she eliminates every day of the week, concluding, "Having eliminated Saturday, I know it can't be Friday because, to know it was a surprise, I'd have to know it was the last possible day." She then states: "It follows that you cannot surprise me with sex, by reductio." The man looks smug.

The final panel shows the following Saturday, with the woman looking at a note that says "Surprise" with a heart and "Love, Todd." The man has successfully surprised her because her logical proof convinced her it couldn't happen, which made any day a genuine surprise again.

The Humor

This comic is a clever adaptation of the classic "Unexpected Hanging Paradox" (also known as the "Surprise Examination Paradox"), applied to a couple's romantic life. In the original paradox, a judge tells a prisoner they will be hanged on an unexpected day next week. The prisoner reasons backward from Saturday, eliminating each day, and concludes the hanging cannot happen. The prisoner is then hanged on, say, Wednesday and is genuinely surprised. The comic transposes this logical puzzle into a relationship context, which makes the abstract paradox both funnier and more relatable. The man's smug expression throughout his partner's logical dismantling suggests he was counting on her overthinking it, turning a philosophy puzzle into a seduction strategy.

References

The Unexpected Hanging Paradox is a well-known paradox in logic and philosophy. It has been discussed by many philosophers and mathematicians, and has no universally accepted resolution. The paradox demonstrates tensions between the concepts of knowledge, belief, and surprise.

View History (1) Original Comic