#2694: Königsberg explain

[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.