I'm amazed how many are not adjusted correctly. The LBS should adjust the helmet and show the owner how to wear it before letting them leave. But I have seen people walk out with the helmet still in the box.
I suggested to my local club that they setup a table at 2 or 3 popular entry points tot he MUP and educate people on how to wear it correctly and make adjustments if needed.
Many times i've yelled "its not a hat, you have it on wrong" with mixed responses.
My other pet peeve is when kids have one on but the parents don't. You know that kid when older will not wear it when alone.