You know what I like even more than fast cars? Fast cars that I didn't expect to be fast. I like to be surprised when I see something blow past me, like that Volvo 245 wagon with a Supra engine that did some smoky drifts a while back.

I love it when some insane engine turns a normal car into a monster. Ridiculous engine swaps that turn slow cars into unexpectedly fast ones are essentially the modern version of the hot rod.

So that's our question today: what are the greatest hot rods out there today?

Here's another one: that Saab wagon powered by the V10 from the Viper. Only a crazy person would come up with a concept like that and then carry it to execution — and that's why it's so wonderful.

Your turn. Tell us about the zaniest engine swap projects and 21st century hot rods you've seen. Go nuts. These tuners certainly did.

(QOTD is your chance to answer the day's most pressing automotive questions and experience the opinions of the insightful insiders, practicing pundits and gleeful gearheads that make up the Jalopnik commentariat. If you've got a suggestion for a good "Question Of the Day" send an email to tips at jalopnik dot com.)