Don't ask me how I know... ...that if your garage floor jack doesn't roll freely, the car will slide off it and you'll smash a brand new aluminum radiator.
That's funny. You win!! Did you make a few p***es for the hell of it? I made it half way to work once before I realized it was Sunday. The whole time admiring how lite the traffic was.
Don't ask me how I know, but don't take your newly-finished build to the car wash and let it idle in the stall because it sounds so good. The shifter "could" lurch into gear and the car "may" drag you out of the soapy wash bay as you frantically try to get the wet door handle open. Said car "might" find a handy chain link fence to climb up before you can reach in to shut it off. Lots of funny ones, but this is my favorite!