A couple years ago I was trying out a new headlight I had just mounted on my bike, cruising around small town VT and got pulled over by a local cop.. He walked up to me, quite focused on my bike with his flashlight and he said:
"Wow, that's a crazy bike, did you build it"?
"No, it's a Buell, made by Harley".
"That's a sweeeet bike".
He proceeded with the usual routine and took my license, registration and insurance back to the cruiser for a few minutes. When he came back he handed me my papers, complimented my bike once more and goes "well, have a nice night, be safe", as he headed back to his car. WTF??
I hesitated for a moment, then asked "sooo, why'd you stop me?"
He said "Oh, you can't have your license plate mounted vertically in the state of Vermont. You have to mount that horizontal", as he motioned to my tag with his flashlight.
Then he got into his car and left.
True story.