1. Normally happens when a girl calls you and tells you she is pregnant with your baby.
2. When a "father's" baby is born and he sees it for the first time, he swears it isn't his and requests a paternity test.
3. When a girl goes through her contact list calling every man to tell him she is pregnant with his baby.
"I got a phone call the other day from this chick I slept with a month ago... I think she was having a Maury Moment!"
Doctor: "Rough day today, some guy was running around screaming having a Maury Moment."