Oh, yes! There have been people who I felt a lack of trust for upon meeting them. It took a while to find out that those people were actually very trustworthy, and kind.

Unfortunately, there was one person I worked with who I trusted right off, respected him - and one day he turned on me like he was rabid. I realized at that time that he most likely has some kind of mood disorder. I felt terrible after his odd verbal attack on me.