Percent
Explanation
The Joke
A singer is performing what sounds like a love song, but the lyrics are expressed entirely in the language of optimal stopping theory and mathematical optimization. Instead of saying "you're the one for me," he sings about having "explored the mate-space 37%" and declares his partner "the highest-rated option after 1/e." The bottom caption reads: "The only good pop music is algorithmically precise pop music."
The comic takes the well-known "secretary problem" (or "optimal stopping problem") from mathematics and transplants it directly into the context of a romantic pop ballad. In the classic formulation, if you want to maximize your chance of selecting the best candidate from a pool, you should reject the first 37% (approximately 1/e) of candidates, then choose the next one who is better than all those you have seen so far. The singer is essentially telling his partner that he followed this algorithm and she happened to be the best option after the rejection phase.
The Humor
The humor comes from the absurd clash between the emotional, passionate genre of love songs and the cold, clinical precision of mathematical optimization. Love songs are supposed to make someone feel special and cherished, but telling your partner they are "the highest-rated option after 1/e" is about as unromantic as it gets -- even if, mathematically, it is the most rational strategy for finding the best partner. The caption amplifies the joke by earnestly declaring that this algorithmic approach is the "only good pop music," satirizing the kind of hyper-rationalist mindset that would genuinely prefer mathematical precision over emotional expression.
References
The "37% rule" or "secretary problem" is a famous result in probability theory and optimal stopping theory. The fraction 1/e (where e is Euler's number, approximately 2.718) yields roughly 0.368, or about 37%, which is the optimal proportion of candidates to sample before committing to a choice.