I've had my rights read to me, but never been handcuffed or taken to the police station.
This was in high school, and I was in the PX on the military base, just wandering around and wasting time. Ran into a girl I knew from a few classes, chatted for a little bit, all perfectly innocent.
THEN some security guy made me come with him into the back room! I was mad, like "WHAT THE HELL???", and they wouldn't even tell me what I had supposedly done! The plainclothes MP (miltary police) was in the back, and she just read me my rights without telling me anything, letting me say anything, etc. It was all very scary for me: I was only 15.
So they were trying to question me, already assuming that I was guilty and knew it, and would try to hide it. Took me a while to even figure out what they thought I had done! Apparently that girl I had chatted with was known for shoplifting and they automatically thought I was shoplifting too, since I talked to her.
At this point I started getting really mad and b*tchy, since I hadn't done anything and I knew it. They gave me a form where I had to write my "confession" so I wrote them a nice little scathing essay on how it's generally a good idea to actually SEE someone shoplifting before you try to arrest them for it. They searched my stuff and found nothing, realized their mistake and started getting really embarrassed and apologetic.
Then my parents showed up, and they were <i>really</i> mad. The MPs very quickly let me go with lots of apologies on their part.
And that's why I hate MPs and stupid people who have zero powers of observation.