Here is one of the XP2006 workshop antipatterns the group worked on.
Concurrent work on to many stories
None of the stories are done at the end of the iteration.
All stories are in progress.
Desire to go as fast as possible
Big stories are not split (seem to be unsplitable)
Belief that multitasking is faster
Stories don’t get finished
No data to plan the next iteration
The team feels bad
The team gets blamed
There is nothing to integrate
Split stories so they can be completed
Take on fewer stories per iteration
Minimize work in progress