Alright, everyone's plans have sucked ass. Here's your BEST BET.
First off, HAM? Eww . . .
It goes to the ducks.
The knife? I will wait with it, holding it non-menacingly, frozen in place as I slowly feed ducks the sandwich. I will not let go of the knife. The cops will continue to close in on me as I feed the ducks and hold the knife. Eventually, they will get sick of waiting and taser me, at which point I spaz the knife into my arm and collapse. The ducks run away because of my sudden drop.
Yay.
The police just followed standard procedure but the entire news media saw it, and people are morons who are easily swayed by their emotions. My kindly gesture of feeding ducks makes me appear innocent, and public oppinion is on my side. Now, when I go to trial, I'll be countering the unspecified suit with police brutality, because they shouldn't've tasered me, even though I know that they should.
I win excellent PR, and likely a lot of money. Epic. Fucking. Win.