The Psychlos were a race of Rastafarian aliens in Battlefield Earth that took over Earth in the year 2000 in just nine minutes with mostly punch-based weaponry (and some help from Nic Cage's Career). All but two of them were destroyed when a single Earthling activated a nuclear bomb on their homeworld and annihilated it.
How they managed to survive as a race up until that point is one of the greatest mysteries of the Tiradesverse, as they seemed to do nothing but lie, hurt, and backstab each other to a stupendous degree, in addition to just being outright morons in general.