So, I went to upload a picture of myself to twitter because I was tired of the default o_O thing. The first picture I selected was far too big, but twitter said "nice picture!" anyway. I didn't realize that my original picture was too big, but when it showed up on the site as a "perlpilot" instead of my picture, I kinda figured something went wrong. :-)
I resized the image and uploaded a properly sized picture (which uploaded just fine), but then twitter complains about the size of my picture. There's clearly some saved state that isn't read at the right time.