What I find really funny about that illustration is that the guy is offering a huge rock that must have cost the best part of a year's wages, but can't be bothered to buy a decent bunch of flowers! I mean, come on - they look like they were picked from someone's garden on his way to the office! Even a single red rose would have been better than that.
Another thing, isn't it a bit of a coincidence that the sister was studying about the dangers of becoming unevenly yolked one minute, then the next thing she knows she is being subjected to an impromptu proposal by a work colleague. Thank goodness she had studied her Watchtower earlier which had pre-warned her about the dangers of men jumping out in front of her with engagement rings so she could be ready with her hand raised in a stop sign!