When I say this, I mean you bought a game blindly with very little or no prior knowledge on how the game plays or what it's about, didn't play any previous installments in it's series, and you didn't know about the hype surrounding it. Here are my examples...
Bayonetta 1&2 - Never even HEARD of these games until July, and did little research on it. Only reason why I bought it is because it came in a 2 games for 1 deal. Boy am I happy I did, enjoying the hack and slash gameplay along with her connection to sorcery so far and can't wait to play part 2 (playing in the Peach oufit doesn't hurt either 
).
Valkyria Chronicles - Found out about it playing Project X Zone and found out it has to do with WWII. ANYTHING WWII and with Video Games I know I am going to love. Later I found out to be a hidden gem in the PS3 library, and it became the main reason I want to rebuy a PSP (for it's sequels on it). My copy got stolen :-/ but will buy it again with any Black Friday specials.
Super Metroid - It was for $20 and I just finished Super Mario World and All-Stars as a 10 year old kid. Told my mom to buy it, and to this day it's the best $20 me or my family have ever spent on a game. I thought it was about some robot or a game like Mega Man. Had no idea Samus was a girl until I noticed when I died the person inside the suit had long hair and boobs (lol). I swear I think this game COMPLETELY changed how I viewed women as a so called "weaker" sex as a child.
Pokémon Blue Version - Truth be told all I knew about Pokémon at the time is that it got a 9.7 on IGN. I read about it REALLY loosely, and I thought it was about some Professors "pocket monsters" escaping, and I would have to catch them in some puzzle game. That professor was Professor Oak, and as soon as I was walking in town I was REALLY surprised it was an RPG. Needless to say I was blown away as a 13 year old teen playing it and I'm still of fan of the series today.
Fire Emblem (GBA) - Bought it because I wanted to see where Marth and Roy came from (since they were Melee characters), and neither were in the game. But I played and it didn't matter, soon as I directed Lyn to attack the bandit like an interactive chess game , my reaction was "hey the battle music and the animation is cool! lets do it again!". I was so hooked and since then its become my 2nd favorite Video game series.
