Ah ah. At one gig we had trained the users to always send a screenshot of the entire screen. People reviewing the tickets would dump them if the screenshot was cropped and the user warned: "No full screenshot, no ticket".
Why? The most important info was the time at which the error happened (which, for users who were on Windows, was in the bottom right of the screen).
With the time we could look in the logs and the error/bug was usually obvious.