MENTALLY CHALLENGED, otherwise known as Mentally retarded, mental retardism, PWN and other such titles, occurred when idiotic dudes couldn't decide what part of the Universe they wanted to be in, or their affiliations within the Clone Wars. So therefore many people who met them were like "Dude, you're mentally retarded." Even God was challenged in this insulting manner, but then He reflected by dropping a bombshell on Mount Sorrow, therefore proving his dick was actually a rock.