A story that was going around some years ago, the source for which is now unknown, relates how P.T. Barnum was presenting a "freak" show in a tent. In those days, it cost each person five cents to wander around and gawk at the deformed people and animals.

It seemed that too many people stayed too long to look and there wasn't enough room for the new customers; so, Barnum had a sign set up next to one of the tent-flap exits saying, This way to the Egress.

Not knowing what an Egress was (or meant), the people would go through the door-type flap of the tent and they found themselves outside. If they wanted to go back in, then they had to pay the entrance fee again.

In an unrelated situation from that shown above, people were in a building where they noticed that the signs for INGRESS were printed in green but that the signs for the EGRESS were printed in red which might have made the meanings easier to understand.