KISS (not the band)

The acronym KISS popularly stands for Keep It Simple, Stupid - implying that the person being spoken to is stupid (hopefully in a fun way). But the original acronym had no comma. It was coined by Kelly Johnson, lead engineer at the Lockheed Skunk Works. The origins of the acronym are in designing something so simple-stupid that it could be fixed in the field, with minimal tools, under combat conditions. The KISS principle states that most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design, and that unnecessary complexity should be avoided.