Zeppelin

Zeppelins are flying machines filled with light-weight gases and pure evil. They are the favored mode of transport for evil dictators and American enemies throughout time and across geographic regions. Countless examples of power-mad megalomaniacal dictators callously suppressing their freedom-starved, Zeppelin-controlled people from the heights of Zeppelin-wielding power have taught us the dangers inherent in this large, slow-moving, and easily spotted flight devices.

Here's a simple mnemonic device to help you remember this lesson:

Zeppelin = evil dictator.