The most memorable of these for me, by far, was the Surinam Toad on the cover of Windows XP Annoyances by David Karp. Every problem has another little brood of problems inside it. Brr. https://www.oreilly.com/library/view/windows-xp-annoyances/0...
Trypophobia is an aversion to the sight of irregular patterns or clusters of small holes or bumps. It is not officially recognized as a mental disorder, but may be diagnosed as a specific phobia if excessive fear and distress occur. Most affected people mainly experience disgust but not fear when they see trypophobic imagery.