Here's the tactic: Find a public location which you know police will be forced to clear, make sure others are around to take pictures/video, interlock in a way to make it very difficult for police to move you, and wait.
It works. There is absolutely no way for the police to look good when they clear the area as they have been ordered to. Tons of videos show up on the internet.
Police are being ordered to clean out the various "Occupy" camps. Nothing too surprising there. Those among the "Occupy"ers who are dedicated or professional protesters or among the group of people who look at it as a right of passage to get arrested by the police while in college have resisted. Nothing surprising there. Videos are all over the internet and news.
Here's an AP video and an Al-Jazeera vid. According to the Al-Jazeera, the police were cleaning out a tent city and this group of kids decided to engage in passive resistance. The AP shows more of the occurrence than anything else I found. Note the police ordering the kids to "move." Note the kids on the sidelines screaming at the resisters to "not move." Note the police trying to physically separate the kids (unsuccesfully). Note the officers being extremely obvious about their plan to use pepper spray. Note the yells "protect yourself" and "close your eyes." note the kids on the ground actually taking steps to protect themselves so they won't get a face full of spray (hoods and collars up, heads down).
And here's a video which starts even earlier, in which the police give clear warning that they were going to use spray before doing it.
In the end, the police cleared the sidewalk and the protesters got their moment of glory for standing up to the cops. They also got something to put out there to justify themselves.
This is not Kent State. This is a pre-scripted play.