Here's a wonderful couple of adjacent signs on fuel at a local supermarket. The first quite proudly announces "Service Call" which is "Discrete Disabled Assistance". So simply "Ask, phone or visit our web site". However, right underneath is a rather contradictory and very non-discrete instruction...the same disabled wheelchair, but this time adorned with "Sound \horn for Attention".
In reality it's about choices, but the immediate contrast here is super.