I just realized something else just now, and it might be a poor or even immature conclusion to draw or belief to have but at this moment it is what I'm feeling, and so this is what I'm telling you. (who in the fuck are "YOU" anyway?)
When a person believes and tells me that they are good at a particular thing, and they then do that thing in my presence and either don't do it well, or do it in a way that is completley oposit of how I believe it should be done, I suddenly don't trust that person in that particular aspect and now have a huge ammount of doubt about everything they ever said or did or claimed to have expertise in. (the exception is if they tell me that the screwed up or had troubles that time or whatever. What I'm talking about here is if they did the particular thing and they did it extremely poorly and still boast about their prowess in that area)