Besides the usual like Taxi Driver and Joker

Legion

Lol not sure if serious

He's most likely talking about the show cus the actual movie is dookie water

black swan
mulholland drive
PI
machinist

only ones i can think abt rn

memento

Images (1972)
Ben X (2007)
May (2002)

Shutter Island
Gone Girl
Vertigo

not original, but one flew over the cuckoo's nest

Can it be considered a thriller tho

yeah, it's more drama than thriller

The Game (1997)

Still a great pick

Perfect Blue

Angst

The Devil's Advocate idk if it counts because maybe it's fantasy but man does that movie go hard.

Audition

Shutter Island is goated

Idk if Twelve Monkeys count

Insomnia (2002)

Taxi Driver
Joker

oh yeah MD for sure

falling down

Invisible Man and how niggas around her were gaslighting like a mf