Here's one for the ABCs
Any one grape can be represented in so many different ways that while you're ordering your Chardonnay you may as well ask the waiter how long is a piece of string, and pay corkage for the pleasure.
Just consider the wine world's two most popular (or common) grapes at their worst: it might just be a choice between being clobbered by a fat-arsed bloke in a duffel coat (Chardonnay) or slashed by the piercing acid burn of sauvignon blanc...