Most of us know whats on the shelves at your average game shop but that's not always the case. Have you ever bought a game simply because you picked it up off the shelf and liked what you saw? What's your best experience with that?
For me it was Syphon Filter. I bought it at my local EB back in the PSX era simply because the cover art was interesting and I'm so happy I did, I was blown away by his awful running animation but fantastic action sequences.