Is it time to attack yet? (Image Credit: Hunda [Flickr])

Male macaques will pay (in form of fruits) to get a peek at the hind quarters of a female macaque.

Actually, that’s not all: they will also pay to gaze at pictures of dominant "celebrity" monkeys (i.e. the high-ranking males) in their pack. Huh.

Anyways, if that isn’t enough bad behavior for you, think about this: macaque males will attack their enemy when he is at his weakest: during orgasm.

Attackers often use considerable cunning to get near their victim without arousing any suspicion. They may feign indifference by barely glancing at him, digging casually in the sand or pretending to collect handfuls of pebbles. But the moment their victim ejaculates, they jump him, hitting, biting and tugging at his fur. (Source)