Well, I don't know about others, but for me this is one of the more common errors I see when developing. Or when copying and pasting code snippets from internet support forums. I would not be able to reproduce it out of the blue, but I did recognise the "invalid object name" error, and I have not ever seen a message that even resembles the "cannot find ... inside TempDB" one. (plus, that one is extremely unlikely, as the database for temporary object is called tempdb, not TempDB - but I guess only people who are in the habit of developing on a case sensitive instance would know that).