9. A Big Piece Of Garbage (S1E8)
Loosely based on the 1998 movie Armageddon, this episode follows the storyline of the Planet Express as they attempt to deal with a massive ball of garbage that threatens 21st century New York.
The spherical garbage mass is based on the Khian Sea waste disposal incident that took place a decade earlier, but this was definitely Futurama's way of calling out humans and their treatment of the Earth. In a way, it is almost a threat of what is to come if we don't start looking after our planet.
The trash ball is also kicked away but someone who appears to be New York's mayor of the time, Rudy Giuliani.
There's even a reference to a terrorist attack that happened in 1991 and resulted in the death of one of the terrorists, as they had accidentally set the timer for two minutes and not five minutes after attaching the clock to the bomb upside down. The Professor makes a similar mistake when setting up the bomb to destroy the garbage. Again, pointing out how useless humans can be when saving the planet.