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I came over to help you out with your math homework. I figured you could use it on such a hot day…
— Mike Damone · Fast Times at Ridgemont High

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker connects an offer of maths help with the weather, although a hot day hardly explains a need for homework assistance. Read as a pretext for visiting, that awkward connection supplies the humour. The unfinished thought leaves room to suspect another motive behind the offer.
Context reviewed