The day before principal photography.
"Hey, bro, we got everything?"
"Uh... we got actors, we got a set, we got a ouija board..."
"Do we have lights?"
"Dude, they got lamps!"
"Oh, okay. But we have a cinematographer, right?"
"Don't worry. My buddy has made a birthday video on a camcorder before, he got it all covered."
Or: The movie that was 100% neither shot with a flat profile nor with a cinematographer who's actually learned their trade. Also, if you have a dialogue, get the bloody mic in front of the character's face. And even if you screw it up at least TRY TO FIX IT IN POST! Yes, you can actually edit audio tracks!
And please, whoever was in charge of the camera: Go watch at least 10 movies before trying again.