I think a classic PSA was the guy with the egg and frying pan.
http://www.youtube.com/watch?v=l9OGpiB7Zpo
There was a sort of follow up to it a few years ago. Not nearly as good.
http://www.youtube.com/watch?v=qyXFN4ocN_o
I've come across some new ones that I think are the best I've ever seen.
http://www.youtube.com/watch?v=0Haa4QImf40 -Accident at the clothes store.
http://www.youtube.com/watch?v=Qf_LWq88H5I -Accident at the warehouse.
http://www.youtube.com/watch?v=rON7EeT0Nxg -Discouraging Man on Woman violence.
http://www.youtube.com/watch?v=noFCekWiUGE -Accident in the kitchen.