I've been called for jury duty once, and wound up being seated, and was foreman. We acquitted the guy, accused of stealing some stuff from a cop car. I think he was guilty, but none of us thought the State proved their case beyond reasonable doubt.

It was an interesting experience, and I was heartened to see that pretty much every juror in the group really took to heart the whole "presumption of innocence" idea and the notion that the State really had to prove guilt, not just hint at, or suggest, guilt.