Was with the fam in South Africa and the kids begged to go to Monkey Jungle, an enclosed park where you wander around and check out lemurs, monkeys, etc. We knew to keep our stuff close and so we kept tight grips on backpacks, cameras, phones, etc. We were nearing the end of the walk when this sneaky little bastard starting eyeing us:
In less than 2 seconds that little spider monkey jumped onto my wife, ripped the glasses from her face, and tore off up a tree. My wife is basically blind without her glasses, and we were leaving the country in 2 days so there was not enough time to get a replacement pair. I kept my eye on the little thief, which included him trying the glasses on and looking through them. After a few minutes of biting them, hitting them on the tree, etc he got bored and threw them on the ground from about 30 feet up. I snatched them up and miraculously they weren't broken. So my wife now wears glasses with monkey bites on the frames. Telephoto pic of the primate thief wearing her glasses: