San Francisco went from being one of the most pedestrian-friendly cities in America to the #1 worst after the dotcom explosion here. Locals chalk it up to SUV-driving business douches driving carelessly, but I think it's more likely that this just coincides with everyone owning a cellphone and trying to check Facebook as they drive.
The SFPD now have undercover officers out on the streets crossing here and there and looking for drivers who are, well, being dicks. I support this idea.
SFPD Running Pedestrian, Speeding Stings: News: SFAppeal
This is not the month to honk at that pedestrian entering the crosswalk as you approach. Hell, no month is that month (they have the right of way, dummy), but this is ESPECIALLY not the month -- according a release sent to media, SFPD will be conducting pedestrian stings during "peak traffic times...at various locations throughout The City including: the Geary Street corridor, San Bruno Avenue corridor, Bayshore Boulevard, Sixth Street corridor and Cole Valley."
In these stings, it's the driver who gets stung, not the pedestrian -- ringers will be in marked and unmarked cross walks to see if you grant them their right of way, and cops will also be watching for red light, stop, and speed violations.