What came first, the chicken or the egg. The chicken (via a genetic mutation that was passed on).
The stars in the night sky don't exist (the light takes millions of years to reach us, therefore the star has already died).
If you had a powerful enough telescope, you could fly into space, look back on earth and watch the 1986 world cup again. (the light takes time to reach you if you are far enough away the light would show a historical image).
Russell's teapot or anything related to Pastafarianism is quite interesting.