I was at EWR a few weeks ago and used the Elite check in line at security. The regular line was snaked all over the place. People were waiting at the down escalator.
Was dressed in jeans and generally non elite looking.
Older couple waiting in line in front of me said. "This line is for first class only"
I opened my card folio with my AA Plat, HP Gold, CO Plat, Hilton Gold,President Club access card, Admirals Club & SPG Gold. I showed them my passport that also has stamps from all over the world. They promptly turned around, quieted up and acknowledged my eliteness. Pretty funny.