#2694: Königsberg
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Transcript
[Cueball, standing next to two men wearing wigs, pointing with a pointer at a map showing the seven bridges problem, with an extra bridge added in dashed lines]
Cueball: Lord Mayor of Königsberg, I will reward you handsomely if you construct this bridge before my friend Leonhard arrives.
[Caption below the panel:]
I tried to use a time machine to cheat on my algorithms final by preventing graph theory from being invented.
(Sourced from explainxkcd.com)
Title text:At first I thought I would need some gold or something to pay him, but then I realized that it was the 18th century and I could just bring a roll of aluminum foil.