Had some encounters, but never quite ticketed:

Stopped several times at night. Cops didn't know the laws. They thought I needed a rear flashing light, when the law only required a reflector.

Stopped several times for riding on the 'wrong' side of the road (which is actually permitted by law, in certain states at least, in some circumstances in which it is justified).

Was suspected of intending to camp overnight in an area where it was not allowed (this one was such a close call that it was an adrenaline rush).

Was suspected of camping in an area where it was not allowed (this one was a blast -- I saw them coming and watched from a camouflaged vantage point while they searched in vain, even though the bike was a short distance away from them, also camouflaged).

Was verbally reprimanded (over the speaker system of a police car) for rolling a stop.

Was stopped and questioned while riding through a wealthy, nearly gated neighborhood (where my only intention was to take a detour to revisit the neighborhood, where some relatives used to live, and to wait for the traffic to die down on the PCH). The cops felt guilty -- being relative newcomers to the area -- when I truthfully let it be known that my relatives had been there for generations, and I used to spend Christmas there during childhood.

These encounters ranged from mildly unpleasant to downright fun -- sometimes in the same encounter.