Of course you have- you're a US citizen. Here in .au I have never seen that happen, and I worked nights in the nightclub districts for 30 years, in fact only recently 2 police were disciplined for overly rough treatment of homeless people in my home town. It's so rare that any video of police violence would make the major TV news channels.
I'm frequently astonished by the violence used by police in traffic situations in US reality TV shows about cops- I have lived in both the UK and Australia and the only conclusion it is the national love of violence the US population has (see gun laws, Iraq etc etc etc) that results in such poor policing.