Strangers in the night

Do you ever find yourself walking behind someone just close enough that you're aware they know you're there? They're maintaining a pace that makes it impossible to overtake them, and to cross the street would look insincere and antisocial. But at what point do you think you should engage in some kind of conversation? Even a simple pleasantry? Maybe you start wondering if you and this equally paced stranger are attending the same party? After all, that appears to be a bottle of wine beneath her arm. Wait, that's just a newspaper. At least she's literate, and keeps up with the news, unless she just buys it for the comics section, but then, she has a sense of humor.