What's the worst thing you could possibly do on a first date? Asking for a friend. – Getting Ghosted I'm not exactly sure. The list is long. Probably some sort of grisly mass murder scenario would be a turnoff for most people; so would explosive diarrhea, but equally high on the list would be clipping your fingernails while waiting on your meal ... say, at a nice restaurant ... or really even on the bench outside the takeout window at Sandy's Custard. That shit is not OK – even if you just went swimming at Barton Springs and want to get at them while the nails are still soft. N to the fucking O.