Oops, We Forgot to Proofread That Layout

Can you imagine a transit bus-side making its way to an actual bus with a grammatical error as obvious as the one is this picture? As the Banterist points out and as all of us in the ad industry know, we have some of the most arcane approval processes known to man and to think something like this could slip through is unconscionable. Wait. Who's kidding who, here? We're talking about ad agencies and clients. Not English teachers who actually understand the language.