Conflating correlation and causation can lead to making dangerous assumptions. There are people refusing to vaccinate their children based on the idea that it might be linked to autism, when really, most scientists agree that there is no causal relationship, and the rise in autism is more likely a result of better diagnosis and understanding of the broad autism spectrum, as well as the heightened desire for parents to have their children who may be exhibiting symptoms to see a health professional, which just happened to be timed alongside more compulsory vaccines. There is, however, a very real causal relationship between a lack of vaccinations and a rise in illness.
Although the Correlation/Causation discussion tends to be pretty serious in academia, it can also be hilarious. Check out these hilarious correlations-- that would be really hilarious if you were to propose that correlation is the same as causation. For example, the Marriage rate in Alabama has a .9 correlation with the rate of death by powerline electrocutions. Wanna save some lives? Tell people not to get married in Alabama, and there will be one less death by powerline electrocution.
Sure, it might be a totally dorky thing to find amusing, but I thought I'd share it anyway!