I used to meet my wife for lunch all the time when she worked at the mall. I'd park my bike (at the time, a VF1000R) up on the huge concrete walkway, but off to the side, near the entrance. After lunch, I'd be walking out, and I would see people leaning against or sitting on it thought the glass doors. Most times they would see me coming, helmet in hand, and they'd get off and walk away. So I started leaving my helmet and jacket indoors and walking out to confront them.
I had one guy leaning on her reading the paper, waiting on his ride or something. I walked out the door and started to walk past him. I stopped and walked over to him and said "man, that is one nice looking bike!". He just shrugged. I asked "How much do they go for?". He looked up at me from his paper like I was annoying him. So I said, while leaning in on him, "Because I know how much I Paid for THAT ONE!" Getting more sarcastic in my tone with each word. His eyes got real big, and he muttered a "Sorry" while he scurried away.
Assholes... you'd be real pissed if you saw me sitting in your car, or fucking your girlfriend... Why would you think I would want you sitting on my bike?!