Siew Ming Cheng, a design student at National University of Singapore, has invented a vest full of plastic spikes dubbed Spike Away that commuters on the city-state's crowded subways can wear to prevent themselves from being jostled and squeezed by other passengers.

While the spikes look threatening, they are made of plastic. The actual function of the device is simply to scare people off. However, because the vest looks so ridiculous, the designer herself will not wear it in public.

Compared to Spike Away, other tactics and strategies for maintaining one's personal space on a crowded subway, such as practising bad personal hygiene or behaving in an overly aggressive manner, may prove to be more realistic.

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