Personal Incredulity

The fallacy of personal incredulity occurs when one finds a concept difficult to understand, or simply does not fathom how it works, then they conclude that it is likely untrue.

Example of Personal Incredulity

Irene was 89 years old, had never left the small town in Iowa where she was raised, and she had never seen a sea vessel. Though Michael had tried to describe what Navy life on the submarine would be like, she didn't believe a word was true. How could a glorified metal tube sustain the lives of many men, while submerged for months at a time?
"It is not possible that we landed a man on the moon. How could a tiny capsule with relatively primitive computer technology travel millions of miles in space, travel through radiation, avoid space debris, land and then make the return journy unharmed?"

This is a common fallacy.