Caps Lock, in prime position
One of the biggest, easiest-to-hit keys on the keyboard is used mainly by accident.
Category: Keys & screens
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Fault. It is a leftover from typewriters.
Caps Lock descends from the shift lock on mechanical typewriters, which physically held the carriage in its upper-case position. That job made sense then. On a computer it mostly causes accidental shouting.
Source: Caps Lock, Wikipedia.