As a kid, it was the Goldbox AD&D rpg's on the Commodore 64 which begun my obsession with roleplaying in general. In particular Curse of the Azure Bonds - it was probably the first epic adventure which kept me awake at night.
Bard's Tale III also drove me quite insane and kept me up late at night wandering its wonderful dialogue heavy dungeons. Many moons were spent with that game!
Later on, I actually wagged school a couple of days playing the original Warcraft. When the sequel came out, I had to wait until the school holidays to get it to avoid it clashing with study habits.
More recently, the Baldur's Gates, Planescape Torment and Might and Magics 4-8 have taken a rather massive slice of my freedom. All hours, pleasurably spent of course. [img]smile.gif[/img]
Speaking of addiction - Back to Clouds of Xeen for me! Mwa ha haha (as Lord Xeen might say)