Something more conventional, or more weird, depending on how you look at it - a propeller-driven bicycle, conceived in 1936:
A similar idea powered Alessandro Anzani's cycle, one of the first of its kind, in 1906:
This thing will kill not only every pedestrian that would happen to pass by, but also every dog that jumps at it.
The idea lives on, however, even if only in the hands of homegrown inventors and tinkerers:
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