When using a public computer, don’t leave any of your accounts logged in. This should go without saying, however, in the casual environment that exists around WUOG where computers are not the only things that are shared, leaving a Gmail account logged in is not uncommon.
This is a terrible habit, and should be punished. That is why Internets Etiquette dictates the finder of said Gmail account should send the most wildly inappropriate link to the offending party.
The recipient is then obliged to both click on and view the entirety of the content. However, if the viewer has already seen the offending content, then the viewer is not obliged to review a second time.