This is an old post (March 2009) that someone retweeted but still holds true on how to work out if an expert is really an expert. It also is a guide how not to fall into common traps that so-called experts fall into.
Links
I had a very weird problem where my menus on a WPF application were dropping down to the left instead of the normal to the right.
I once heard that the way you can tell if something is actually funny is that it causes you to laugh out loud even when you are by yourself. It is much easier to laugh at something when surrounded by others.
This has a great summary of what to do when things go wrong when using Git. Added here so I know where to look in moments of panic.