If you were woken in the middle of the night and told about an annoying false positive you would immediately realize that your spam filter had been a bit over-eager.
For many though, spam terminology is a teensy bit confusing. This probably has a lot to do with the naming convention: When spam is detected this is “positive” – But spam is a not a very positive thing. And of course legitimate email is “true negative”. Very intuitive…
Therefore in the interests of greater global understanding we present the above info-drawing-thingy.