People have the tendency to chase away a fly from a table with food, although the fly does not eat and does not bite. Why? Does the fly suffer from discrimination? For instance, people hear stories that (all) flies may transmit diseases without verifying this scientifically. Would people have the same reaction if they would know the fly better, for instance when they see the fly expresses cleaning behaviour? Why should flies have less efficient cleaning behaviour compared to domesticated animals, like domesticated dogs or cats? What do we really know about the efficiency of so-called cleaning behaviour in wildlife, and consequences for interactions among so-called species? How often do living beings suffer from an unfounded reputation? In what conditions do people generalise when they hear one story or see one event? Is the human discrimination reaction towards insects or other living beings an innate response inherited from ancestors, or is the human reaction towards insects or other living beings based on individual experience? Is discrimination a safety response towards the 'unknown', for in the case that knowing the 'unknown' takes time? Do discrimination reactions results from a lack of individual perception abilities? For instance, all flies look the same, so there should be no substantial difference across individual flies in how they behave and live, and therefore all fly phenotypes are treated all in the same way. However, if flies would always be dangerous why do birds, like flycatchers, consume them? What fraction of the time flies are sitting on food in a kitchen (e.g. fruits) to be consumed later in the day? How many bananas contain fruit flies?