This is a Schmidt's red-tailed monkey at the San Diego Zoo. He looks so sad, doesn't he? But I'm sure he has no idea that the set of his face happens to coincide with the human conception of a sad look.
Then again, maybe if someone figured out his favorite food he'd suddenly look a lot happier. You never know.
He doesn't look sad so much as having had a long life and seen some shit, much like Mr. Soft Owl: https://topatoco.com/collections/oglaf/products/og-softowl
Out of control media trying to destroy Major Biden,
https://www.rawstory.com/major-biden-nipped-secret-service/
If you block out the eyes, the bottom half of his face is Mona Lisa happy.