A New Scientist Histories column from '05 noted that the last really huge volcanic eruption led to the invention of the bicycle:

ON 5 April 1815, Mount Tambora in Indonesia began to grumble. A week later the volcano blew its top in a spectacular eruption that went on until July. It was the biggest eruption in recorded history, killing around 92,000 people and ejecting so much ash into the atmosphere that average global temperatures dipped by 3 °C. In the northern hemisphere 1816 became...