Someday, I want to either run or play a campaign, modeled after D&D (in GURPS), that does everything wrong. Not your usual band of misfits that is any adventuring party, a band of misfits carefully calculated to have extra misfit-ery.
Every race can be assumed to have all of the various roles, but usually 90% of half orc PC's are barbarians or fighters, gnomes and half elves are bards, halfings are rogues, etc. Humans are about the only race you ever see in every role. I want to see that party that doesn't follow the "class specialty" conventions.
Cleric? The half orc. He's a chef, fights with a war-ladle, and uses the top of his cookpot (complete with all his spices and such) as a wooden shield.
Bard? The dwarf. Plays something like bagpipes or the concertina.
Barbarian? The gnome. Works his day job as a gardener, chops the knees out from under his enemies with a sharpened shovel-axe.
Fighter? The halfling. He'll stab your shins so hard you won't know what hit you. Probably a smith or something for his day job.
Wizard? This one's a bit hard to pick out a "wrong" race without repeats. I'd go for troll, if troll PCs are available (think Shadowrun trolls). He also has a cart, and the critter that draws it is his familiar. Spends his time studying while leaving the familiar to guide the thing.
Rogue/ranger? Warforged/golem, perhaps, something big and heavy and built to be a bruiser by nature. Troll and half orc would also work.
And so on. Every race has classes that seem most likely, and classes that seem least likely, and THAT'S where I want to put them. If anyone who happens to read this can come up with other "wrong" professions, that'd be just swell.