United States: Psychological research conducted at the University of Missouri-Columbia has shown a correlation between mood and credulity. In particular, being in a good mood correlates with believing any old bollocks.

Laura King, professor of psychological sciences in the College of Arts and Science, along with a faculty member from Johns-Hopkins University, tested the notion during a series of interesting studies that examined how mood and intuition can affect a person's beliefs - even under the most unique circumstances and scenarios.

When you're in a good mood and more intuitive, you're open minded, creative and engaged in what appears to be reality, King said. You make non-rational associations.

The research investigated phenomena such as UFO and ghost sightings, sympathetic magic and cooties. So, next time a fundie tells you how great their imaginary friend makes them feel, you know what it is.

Good Moods Spark Overly Credulous Beliefs, Study Finds—Research at MU, 1st June 2007.