I just received a bug report by email which had a 6MB attachment. This meant that I couldn't preview it with my mail monitor program, which meant I had to wait until I could launch my regular email client and download the email to decode the attachment.
When I opened it, it turned out to have a PDF file in it, which then contained a 1920x1080 image of the person's entire desktop, in which the only thing interesting to me was VirtualDub's tiny crash dialog in the center -- which says to attach the diagnostic text file instead, because the dialog itself doesn't contain detailed crash information.
Please, folks, when you're asking other people for help, try to be sensible. There are already enough reasons why your email might not be answered; you don't need to give the person another one.