40 years ago, two American men walked on the Moon. One small step for a man... opened the floodgates for pop culture references ad infinitum.
The New York Times has an overview of these flights of fancy that you can read here.
What else was happening on July 20?
If you believe they put a man on the Moon, you might enjoy watching indie-turned-superstar REM perform their song Man on the Moon with super duper star Bruce Springsteen