Many of the pieces of Scrum are deceptively simple. In their simplicity, where many feel they have a clear understanding, the fact is that they really don't. As Ken Schwaber has a habit of saying, "Scrum is simple, but really hard." The daily scrum is a perfect example of this. Of all the events I have witnesses over the years, it is the Daily Scrum that is more often not just done wrong, but done completely wrong (in fact, there are more tips coming in the future about the Daily Scrum).
Nothing kills team productivity faster than trying to work on three or more backlog items at the same time. You end up with a team that's really good at starting work, but really lousy at getting it finished. Agile pretty much started with comparisons to Rugby, so let's go back to that proven metaphor to see what I mean.