Sudden pleasant things.

Mike: "A pregnant pause, then."
Me: "I won't go into any detail but that's not physically possible for me right now."
Mike: "Ah, okay. That's already too much detail."

Does anyone know the proper etiquette for when you run into someone you like but are in the early stages of getting to know and they're on their cell phone? Are you suppose to:

• rapidly calculate how much you want to talk to them versus how much they probably want to talk to you on a sliding scale of how nice the weather is and in what sort of hurry you are while walking towards them? 
• eavesdrop on their side of the conversation to see if it sounds like they're almost done, then slow down/smile and wave and move on accordingly?
• stutter to a stop, look uncertain, and blush until they actually do hang up?

Spotting Cape in the wild makes me do strange things like that last clump of social awkwardness listed. But we segued pretty smoothly into a walk to his car where it was parked downtown.
After fits of I-want-it-NOW-itis, I've come to realize that it's always more fun seeing him spontaneously anyway because it's not infused with desperation. It's just taking advantage of a sudden pleasent thing, like a free chocolate bar.

Yeah. That happened too, and it was also delicious.