The seller says a military aircraft will bring it to you free--right! All you have to do is send him half the money--that's the tip-off--which will be held in escrow by eBay.
Problem is, eBay doesn't hold money in escrow. The seller will have you wire the money to what he says is an escrow acocunt, but it's really a Western Union pickup.
You'll get an assurance that the car is being put on to a military plane, then you'll never hear from the guy or see your car gain. This scam has been posted on Craig's List and similar venues recently. Remember: If it sounds too good to be true, it is. (And the words "escrow," "overseas shipping," and "guaranteed" are alarms.)