Reminds me of when I was a nipper working on a helldesk which didn't have a dedicated email address (this was back in the 90s). There was just me and one other guy working on it at the time and users would email us directly for help.
I thought it would be a jolly jape to set up a forward so that every email that came to me got forwarded to him for him to deal with. Once he realised what I'd done, he thought it would be even jollier if he reciprocated and sent them right back to me. It only took a few minutes for the mail server to fall over after we created our loop. In our defence we realised straight away that it was our fault, removed the forwards and once the dust had settled we owned up. Our long suffering boss took it in her stride and just told us not to do it again. Lesson learned.