Pretty much whenever I get into a subject. I have a fairly maniacal persona, If I enjoy something, my concentration is going to be set directly at that thing for days until I either think I have found out enough or end up in a dead spot because I start lacking material that I could study further.
Numerous times have I been told this. Most of the times, it hasn't been true.
I don't typically run into the problem of dwelling on it for too long though, because I just ask them bluntly. I ask because I assume they would have a reason for doing it, but typically I just get "Oh I didn't really mean anything by that, don't think too far into it" or something along those lines.
I get told this quite often and I suppose I do tend to over-react to things (e.g. others incompetence).
I got told this yesterday whilst reading an email. I was livid with the response although it only said 'there was no overnight solution' to my requirements. I think the reason I got so mad was that I'd (in my J way) already given the department five months notice of what I needed to be done grrr.