I had a friend who beat his case by filming the route and area he got the ticket on, showing that the police officer's description of the events was impossible for him to have witnessed. The Judge was peeved at the waste of time: Charges dismissed.
Personally, I was pretty much guilty of every offense I was ticketed for, but one. And that one got the fine cut in half at court.
What PO'd me was the 8-10 parking tickets I got, from an area that it later turned out the city had no jurisdiction to ticket. They never did offer to pay it all back either...