The world's shortest conversation?

Although spanish is generally prolix, it doesn't have to be.
While shopping in Baza this morning I was walking past the entrance to a block of flats when the following conversation took place:

Kid walks up to door, presses button on entryphone. Voice of a woman:
Si?

to which the kid responded
Yo!

and the door opened.
What's truly remarkable is that this is the first time I've ever heard two spaniards speaking to each other and fully understood what was being said. My spanish must be improving.  

hey Pete-I
I love when you say "HOLA" AND THE PERSON SAYS "ADIOS" as you pass each other..Does,nt seem rude here  

Adios, in this context is correct, in my understanding. Indicating to you that the person does not wish to stop and have a conversation.

Blatantadvertising.com wrote:Adios, in this context is correct, in my understanding. Indicating to you that the person does not wish to stop and have a conversation.

Yeah, I get that a lot.  

Yes Blatantadvertising this is correct but in the early days here in Spain it took a little bit of getting used to..Back in the land of hope and glory it comes across as being badly educated or ignorant and on occasions ending in a slap or someone getting a thick ear     

I've never taken it as rude - I just appreciate that most people greet each other here! Some of the older poeple still say 'Que te vaya con dios' which I really like, and so many people take time to stop and talk to you. 'Story-book friendly' is how a visitor of mine described it after we'd been for a local walk and came back, many conversations later, laden with fruit and vegetables.