Do you have a favorite weapon from any game? A specific sword? A general type of weapon? Something that stuck out to you?
For me it has to be the Jade Jambiya used as the calling card of the Silent Whisper (I think that was their name) in Al'Qadim. My first experience with Al'Qadim taught me a whole lot about role playing, challenges, culture shock, and a number of other things. In that game, the GM used the Silent Whisper - an all female order of Holy Slayers (religious rogue assassins) as a sort of anti-hero antagonist. They weren't necessarily villains. They had reasons for doing their actions, and those reasons were actually better than why the PCs were there (i.e. they were defending their home and right to live, we were looking for a payday and some loot.)
By the end of the game, my tiny peon brain had been opened up to the worlds of possibilities that even just one RPG could have. I'm not sure I'd still be involved in RPGs if not for that campaign, those npcs, or their signature calling card that piqued the interest of my Elven spell filcher.
How about you?