A place to eat and get messy! But be careful the most deaths on a starship happen in the mess hall! In 2364 there was a massive killing in a mess hall. 8,654 people died that day…
This was not without precedent: in 2266, Lt. (j.g.) Joe "Happy Smiling People" Tormollen got into a sweat about nothing and killed himself with a butter knife. Of course, this was a suicide and only one person died. And it happened in a redressed briefing room and not a mess hall. Actually, this doesen't apply at all. Sorry.