Run up to a solid object until you cannot go any further, but keep walking into the object, preferably while rotating left and right slightly. When the object is walked into, the turn speed increases.
This is especially noticable when trying to run up or down stairs in a airport tower. You'll sometimes see yourself suddenly turn too fast and run back down or up respectively. Doorways are a good example too. When movement is ceased, turn speed returns to normal.

Mouse acceleration is disabled.