OK...I'll kick it off. At the Blessed Mother's final appariton to Lucia, Fransisco, and Jacinta at Fatima in France on 17 October 1917, 70,000 people witnessed what they described as "the sun touching the Earth." This solar phenomenon was widely reported in many secular newspapers.
Any logical explanation for this? Here's EWTN's take:
http://www.ewtn.com/fatima/apparitions/October.htm