Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

The Joke

A couple is shown in a romantic embrace, with one partner declaring "I swear, Tom, I will love you until the end of time." This is a classic romantic vow, implying eternal devotion. The scene then cuts to "Later," where a newspaper headline reads "PHYSICISTS PROVE TIME IS AN ILLUSION." The final panel shows the person who made the vow driving away from the house, cheerfully saying "Woo! Off the hook!" -- interpreting the scientific discovery as a literal loophole that nullifies their romantic promise.

The comic takes the poetic phrase "until the end of time" and treats it with ruthless literalism. If time is an illusion, then there is no "end of time," and the promise is technically void. Rather than being devastated by the philosophical implications of time not existing, the character is delighted to have found a technicality to escape their commitment.

The Humor

The joke works on the contrast between the emotional weight of a romantic promise and the legalistic, contractual way the character interprets it. The glee with which the character seizes on a physics headline as grounds for breaking up suggests they were looking for an exit all along and just needed any excuse. It also satirizes how people sometimes treat scientific discoveries superficially, cherry-picking implications that serve their personal interests while ignoring the deeper meaning.

References

The concept of time as an illusion has roots in physics and philosophy, from Einstein's block universe theory to Julian Barbour's "The End of Time" (1999), which argues that time does not exist as a fundamental feature of reality.