What does this mean?

Thanks to my Twitter pal, @theelusivefish, the mystery is solved. It was probably part of a garage display tied to this ad in Popular Mechanics for AC Spark Plugs Cleaning Stations . I asked about the pic on Twitter and @theelusivefish had the answer in less than five minutes. Amazing, and thanks!

 

Here's the LONG link

books.google.com/books?id=XdwDAAAAMBAJ&lpg=PT9&ot... birds were caught stealing gas&pg=PT9#v=onepage&q=these birds were caught stealing gas&f=false

Done