A jet engine means never having to say you're sorry:

What can you do with a GE Model T58-8F helicopter turboshaft engine, converted to jet? With Ron Patrick’s custom VW Beetle you can have lots and lots of dangerous fun exploiting all 1350 horsepower.

Something tells me that, with the intake positioned inside the car literally inches from the driver, holding a conversation in this thing would be a challenge. But boy that afterburner sure would be nice to use on tailgaters during rush hour!