The Personal Incredulity Fallacy

The argument from ignorance actually takes a lot of different forms. One of the most common in day to day conversations is what's called the personal incredulity variant. What this person feels should be possible really is baseless. It's just an arbitrary collection of impressions that they've gotten from their short experiences on this planet. People do this, they they judge what is possible in a field of expertise that they have no idea about.