The Hitchhiker's Guide to the Galaxy T-Shirt
In this book, mice are the most intelligent creatures in the universe, and they decide to create a gargantuan supercomputer to solve the age-old question "what is the meaning of life".
This supercomputer works for 1000 years, and comes to the conclusion that the meaning of life is the number "42".
The confused mice don't understand. The supercomputer says that they are not asking the right question, and if they want to know the question, it will have to create another supercomputer. This supercomputer will be it's superior and a combination of organic life and technology, and he calls this supercomputer "planet earth"
S - 46cm pit to pit and 70cm top to bottom
M - 50cm pit to pit and 73cm top to bottom
L - 57cm pit to pit and 75cm top to bottom
XL - 61cm pit to pit and 79cm top to bottom
For any questions - firstname.lastname@example.org