You know those of us who have put in some years service on the left can appreciate a good slogan. So, I must confess to enjoying reading the account of a student demonstration at one Texas university against a conference held by the main proponents of, ahem, "Intelligent Design". The silent protest included the holding up of posters with slogans such as:
"Why do we have wisdom teeth if they do not fit our jaws?"
"Why did it take 20 species of elephant to go extinct to get two species that survived?"
"Why do the ribosomes (protein synthesizing machinery) in our mitochondria match those of bacteria?"
Scientifically literate slogans I think there's more mileage in this one!