Sometimes what we are trying to say doesn't come out the way we want and the important information gets lost making it hard to get what we really want. Take this conversation between me and my two year old, for example:

R: I wanna macaroni
m: What? You want to eat Macaroni?
R: Macaroni! I wanna watch Macaroni
M: I've never heard of that show.
R:Macaroni, Macaroni (And becoming increasingly agitated and throwing items, etc, etc, etc)
M: You mean Max and Ruby?
R: (nervous laughter) Yeah, Mac a Runi.

See what I mean?