Image via Wikipedia
As we all know, Venn diagrams are diagrams that show all hypothetically possible logical relations between a finite collection of sets (groups of things).
Venn diagrams were conceived around 1880 by John Venn. They are used to teach elementary set theory, as well as illustrate simple set relationships in probability, logic, statistics, linguistics and computer science. *
As the above image shows, these diagrams can be very complicated and intricate.
Or they can be as simple as siblings' children;
Over at www.graphjam.com they regularly use Venn diagrams to get laughs at our everyday nonsense that we go through as humans. I prefer to use Mr. Venn's amazing creation to explain, in an easy and efficient manner, just how my life works;
More Venn diagram buffoonery can be found at mental_floss's blog 'Miss Cellania's Files'.
* thanks to Mrs. Wiki and Mrs. Pedia