Indoor yard sale? really?

google images
google images

I recently saw a sign that read, “indoor yard sale”.  Ok.  What is an indoor yard sale anyway? Does that mean there is grass growing inside their house? Does it mean they picked up their yard and brought it in? I howled when I read it. There are lots of signs like that and they always make be laugh.

Sure,I know what they meant. But wouldn’t “Inside sale”,  or “Sale inside” been more accurate?

I couldn’t bring myself to check it out as I didn’t want to say something and hurt the “seller’s”  feelings. Gave me a good chuckle, though.