Butterflies in the genus caligo are commonly called owl butterflies because of the large spots on their wings that resemble the eyes of an owl. I saw quite a few of these butterflies in the cloud forest of Ecuador, but only this one that appeared to have a tear running from the eye.
Nikon D800 with Nikkor 105mm macro lens, ISO 800, f/6.3 at 1/400th of a second (-0.33 ev)