I imagine a future situation where it just so happens that a small group of people die from cardiac arrest very closely to each other. Upon further inspection, it is revealed that each of these people shot arrows at archery ranges several times a year until their death. An impulsive mind might suggest that repeated trips to archery ranges can cause cardiac arrest later in life. But, thanks to the post hoc fallacy, I can say that it's highly unlikely that the first event caused the cardiac arrest, and that there must have been several other factors contributing to the coincidence.
Quick use of the post hoc fallacy in pop culture