I suppose it's part of my American identity but one of my video game weaknesses is video game currency. It makes games just a bit more addicting for me whether I'm collecting Grand Theft Auto dollars, Ratchet and Clank bolts, Devil May Cry orbs, or even Metal Gear Solid 4 Drebin Points. I'll crawl out onto a raging battlefield to scoop up dropped guns for those puppies even though I almost never need to use them. It's found money, so how can I just walk away? The sound is a key part of it, too. The blips of Drebin Points and whoomp of Devil May Cry orbs can't hold a candle to the king of game currency -- Ratchet and Clank bolts. The jangling of those bolts as you scoop them up and they literally float into your account must've been designed by someone with some serious psychology chops. The clicking of the studs in Lego Star Wars probably comes in second mostly because I liked Legos so much as a kid.