I think you are all going a bit overboard!
To antonlamont45:
Does this happen alot, or was it just once or twice?
The dock goes down and comes back up when you have altered something on the dock, whether it is a setting, or the insallation of a software update. It happens when the dock restarts.
Mac OS X will just restart the dock application part of OS X to apply new changes etc.
Nothing major, just a part of OS X working
Edit: Also, when an error occurs, the dock sometimes restarts, for example, when a program hangs during start-up.