when a stranger compliments

Today there was a man who looked a little down-and-out outside of a restaurant. As I walked passed him I felt as if he were looking at me and made an effort not to make eye contact. Toting my to-go food on my arm, I got the same feeling, only this time he stopped me:

"Excuse me"

"yeah?"

"I'm on my lunch break and I wanted to tell you that you look really pretty today"

"aww thank you (nervously)"

"Yeah, I would ask you on a date, but I'm sure you have a boyfriend."

"Uhm (panics a bit to try and think of something) yeahh...I do actually" (I don't) 

He nodded respectfully, dismissing me, and I walked back to my car. Wanna know something funny? That guy pretty much made my day. Sure, he was a little dirty, and looked like maybe he enjoyed his substances every afternoon, but he was nice to a complete stranger for no reason. Guys never say things like that out of the blue to me. EVER. I judged him way too quickly: He was dirty, slouchy, and sitting alone, but cleaned up I'm sure he'd be a looker. My thought process as I walked by: Ah, shit. Look straight, look straight ahead, look straight. Regardless of his appearance or situation, he was nice and I was way more flattered than freaked out. Not to say that you should strut passed odd-balls with the hope of gaining self-reassurance, but don't write them off as threats or not worth your simple eye contact. Thanks Guy, really, you made me feel good...and I lied...I don't have a boyfriend, please don't take offense.