At some point during my life I remember hearing that the spring and autumn equinoxes are the only days of the year during which you can sit eggs on end on a flat surface, unless you live exactly on the equator (where you can do it year round).
Dave and I found out for ourselves that it's actually true. We spent about 15 minutes of his morning (my evening) entertaining ourselves by balancing eggs on our counter before scrambling them up for a meal.