Create an alternate history for your day, today. Start with getting out of bed and then along the way, change something so that your day goes in another direction. The same things happen around you, unless they are changed by you or by things you did not do in your alternate history.
As a writing exercise turn your own personal history into a “what if?”…
Alternate History.com
Counter-Factual.net
Google Groups: Soc.history.what-if
Today in Alternate History
Wikia: Alternate History
Other Timelines
Uchronia: The Alternate History List
Uchronia:Sidewise Awards for Alternate History
Changing the Times
Point of Divergence
Wikipedia: Alternate History
Wikipedia: Counterfactual History
Hypothetical History