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At the beginning of the new band season, a group of sophomore boys decides to chat up the incoming freshman girls. During the first week of band practice, the freshman girls wear blue band T-shirts every day, and each sophomore boy speaks to at least two new girls per day. Clearly, the new blue band T-shirts are responsible for a spike in social behavior by the sophomore boys. This is an example of:
What is POST HOC, ERGO PROPTER HOC (AFTER THIS, BECAUSE OF THIS)
"After this, therefore because of this." This fallacy is committed when it is concluded that one event causes another simply because the proposed cause occurred before the proposed effect.