Stupidity in movies and TV shows

Add more stupidity
Murder at 1600 (1997) 1
Murder by Numbers (2002) 1
Murder on the Orient Express (2015 TV show) 1
Murder, She Wrote (1984 TV show) 1
Music (2021) 1
Mysteries at the Museum (2011 TV show) 1
Mysterious Island (1961) 1
NCIS: Naval Criminal Investigative Service (2003 TV show) 1
Naked Singularity (2021) 2
National Lampoon's Christmas Vacation (1989) 1
Near Dark (1987) 1
Nemesis 2: Nebula (1995) 1
The Net (1995) 1
New Jack City (1991) 1
Night at the Museum: Secret of the Tomb (2014) 1
Nightbreed (1990) 1
Nightmare Beach (1989) 1
Nightmare Sisters (1988) 1
A Nightmare on Elm Street (1984) 1
Ninja III: The Domination (1984) 1