There was much excitement over the Futurama x Adventure Time crossover happening this week -- the question was, how would it work? And now that the "Leela and the Genestalk" episode of Futurama aired last night, we know.
It's just a short cameo captured by Superjesterdude102, but still, funny -- especially when you consider Bender and Jake are the same voice actor. As for what the episode was about, here's Wikipedia's summary: "The reason why Turanga Munda appears more mutated than in her original appearance is explained."
Finn and Jake Adventure Time Cameo in Futurama [Superjesterdude102]