Or albums that make you feel a little blue, or isolated, or just fucked up; albums you stay away from if you're already battling with those states of mind...

Here are mine in chronological order:

Leonard Cohen - Songs of Leonard Cohen (1967)
The Beatles - Let It Be (1970)
John Lennon - John Lennon/Plastic Ono Band (1970)
Pink Floyd - The Dark Side of the Moon (1973)
Lou Reed - Berlin (1973)
Pink Floyd - Wish You Were Here (1975)
David Bowie - Low (1977)
Joy Division - Unknown Pleasures (1979)
The Cure - Seventeen Seconds (1980)
Joy Division - Closer (1980)
Echo & the Bunnymen - Heaven Up Here (1981)
The Cure - Pornography (1982)
Brian Eno/Harold Budd - The Pearl (1984)
The Smiths - Meat is Murder (1985)
Brian Eno - Thursday Afternoon (1985)
New Order - Low-Life (1985)
Talk Talk - Spirit of Eden (1988)
The Cure - Disintegration (1989)
Slint - Spiderland (1991)
Manic Street Preachers - The Holy Bible (1994)
Placebo - Without You I'm Nothing (1998)
Blur - Think Tank (2003)
Radiohead - Hail to the Thief (2003)
Placebo - Loud Like Love (2013)