We're hoping you saved that tag, or at least memorized the number on it, because if you find yourself with a dead or malfunctioning key fob, you'll need the PIN to crank up your Harley-Davidson ...

Potato Patent: How Harley-Davidson Tried (And Failed) To Trademark Its Sound. Story by Shane O'Neill ... both connected to the same pin in the crankshaft -- don't fire at even intervals.

Not to mention, there's also that distinct Harley-Davidson sound that emanates from its bikes. If you've spent any time around them, odds are you know that signature idle rumble very well.