When Microsoft calls..

Today, while at work, I received a call from Microsoft from a lovely lady. Here's how it went, more or less.

M$: "Hi, I'm calling on behalf of Microsoft customer service, we are doing a series of interviews in order to make our client's web experience better."
me: "Ah-ah."
M$: "I would like to ask you a few questions regarding the software you use and what kind..."
me: "So, this is basically a market research."
M$: "it's just an interview, we don't want yo sell you anything!" (laughs)
me: "OK, write this down then: we use only open source software, and we don't deal with companies that keep the source code closed."
M$: "So, you are not interested?"
me: "When and if Microsoft decides to release its source code, we might."
M$: "What do you mean 'source code'?" (she's confused)
(I pause for a few seconds)
me: "I mean the code the software runs on."
M$: "Could you hold the line for a minute please?"
(music runs on, me and my colleagues are rolling on the floor laughing)
M$: "Hi... ehm... nevermind, thank you for your time."