Wikipedia: An elevator pitch, … is a short summary used to quickly and simply define a process, product, service, organization, or event and its value proposition. The name “elevator pitch” reflects the idea that it should be possible to deliver the summary in the time span of an elevator ride, or approximately thirty seconds to two minutes.
The term itself comes from a scenario of an accidental meeting with someone important in the elevator. If the conversation inside the elevator in those few seconds is interesting and value adding, the conversation will either continue after the elevator ride, or end in exchange of business cards or a scheduled meeting.
Here are a few humourous pieces we did to promote Open Source Software.
Here a Monty Python inspired piece on Open Source that we used at conferences when we were introducing Open Source Solutions:
This one was a big hit with Linux Developers: