I didn't read "sudden and unexpected changes" as "Hopeful Monster," but rather as "geologically sudden" (i.e. thousands of years).
Take a small, geographically isolated group of ancestral primates and give them an unusual but relatively benign viral infection that causes gradual changes in the geneome and, over a couple of hundred generations, this group becomes "different."
By the way, this idea means the "Intelligent Designer" is actually a bad cold... ;)
By the way, this idea means the "Intelligent Designer" is actually a bad cold... ;)
LOL!