Moon and Microwave Relay Tower, originally uploaded by bradipo.
Across the street from our apartment complex is a microwave relay tower. From where we used to park, outside our previous apartment, the apparent size of the round face of the antenna is almost exactly the same as the apparent size of the moon, and appears over the horizon in about the same place the moon rises.
More than once we’d park our car around sunset, look up, see the round disk of the microwave antenna, and mistake it for a full moon. (The red letters aren’t visible once it gets a little darker.)
In this picture it’s pretty obvious which is which, but on a dark and slightly misty night when the moon isn’t visible in the sky for comparison, it’s a surprisingly convincing illusion.