We're in the holiday spirit, and this week's Car Talk offers several reasons to be thankful. For starters, you probably haven't spent the last couple of weeks trying to get a lug nut off your Lincoln. And even if you have, you probably didn't resort to ballistics. Hear what happens when an armed and exceptionally frustrated shade tree mechanic finally loses his cool. If that's not enough, give thanks that you're not our poor hosts, being forced to play "Stump the Chumps" with a contestant who may have led them astray with the word "thunk." Need more? We've got David, whose wiper blades are so far off, they're cleaning his neighbor's car; then there's Evelyn, who's about to be labeled "Clutch Killer"; and Laura, whose tranny is probably gonna be covering some lucky mechanic's boat payments all next summer. All that, a new puzzler that foils pesky thieves, and lots more on this week's high-caliber edition of Car Talk.