I can tell you what my first DVDS were: it was Psycho and Dazed and Confused, which I ordered online together. I still have both of them, and they’ve been repackaged since with better menus. Back then, the ne us were plain. This is when DVD players were $400.
Then the first DVDHD or whatever you call them, was Bourne Identity. For the longest time, this was obsolete, but it plays on the newer 4K players which decode nearly everything.
Never lose your desire.

Avatar and V for Vendetta

Wild Things, Cruel Intentions, Pulp Fiction, Les Miserables Patriot Games, Rob Roy.

The Hangover

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Can't remember my first blu-ray, it must not have been as exciting as getting that first DVD. That I remember! I got Reservoir Dogs and Basic Instinct on the same day. Both in snapper cases from Live Entertainment.

SPider-man 3. It came with my PS3.

Epic (2013)
Bought it two months before I bought my first blu-ray player. I wanted some Blu-ray movies on hand for the big occasion.
That is all.

The Right Stuff. I was sick of turning over the 2-sided DVD.

The Thing was one of the first ten BDs I bought, it certainly gave me a whole new perspective on it after only having seen the awful non-anamorphic DVD version previously.

Pulp Fiction
My 30 Top Rated Movies!
http://www.imdb.com/list/ls071418511/

Scream(1996) in 2012.

Jurassic Park. Last Year. I was a late convert to Blu but I have never looked back. Seeing the T Rex attack in HD for the first time was an amazing experience!
IT'S A TRAP!!!

Young Guns back in 2009.

Eagle Eye, which I loved at the time for some reason.

Casino Royale (2006)

Willy Wonka and the Chocolate Factory.

Avatar; Extended/Collector's Edition
Inception
The Assassination of Jesse James by the Coward Robert Ford
picked those 3 up together my first purchase.

The Searchers.
http://www.downlinebuildingclub.net/Flatbroke

Close Encounters of the Third Kind: 30th Anniversary Ultimate Edition.

The Sounds of Music

The Goonies, bought it when I first got my PS3 in 2009. Bought it as I had watched the end of it on TV that weekend and thought it would be good to have a copy. Sold it in 2011 as I hadn't watched it once.
My name is Lt. Aldo Raine

Beauty and the Beast: Diamond Edition (2010)
To this day, most of my BD collection consists of Disney films.
"If I told you cretins, your feeble brains would fail to comprehend it." - The Shredder

Three that came with my BD player:
Night at the Museum
Invincible
50 First Dates
As for the first I actually bought and wanted
MirrorMask
, I think.
Passion is just insanity in a cashmere sweater!