Gradually escalating unidentifiable whispering. Everyone starts asking if you can hear something, you all start agreeing you can hear whispering but not what it is, then the paradolia kicks in and people start hearing what they expect to hear. The constant gradual increase in volume. Increases the fear and certainty in what people are hearing, but also disrupts sleep and wakes anyone who was sleeping. Soon everyone is awake, sleep deprived, and panicked.

The low travel on the keys is probably the issue. The machine gun sound of your typing is probably because of long travel with speed making a lot of force hitting the key bed, so having a longer travel will probably help there. Also, chiclet keys are really different to standard keys, they are super flat and have no centering dip so you tend to slide to the edges and have reduced accuracy. Add that to the dense layout and you have a recipe for disastrous typing.