Lichtenberg's Avertissement, written by Georg Christoph Lichtenberg, is a poster intended to deter the citizens of Göttingen, Germany, from attending the performance of Jacob Philadelphia in 1777. The performance was supposed to be an exhibition of scientific experiments; however, Lichtenberg considered it to be a magic show. He was angered by the alleged deception and posted the following satire in order to persuade people to avoid the performance. As a result of the extravagant claims that were posted, Philadelphia left Göttingen without giving any exhibitions.