During the OJ-94 campaign for the blazar OJ 287 the authors have obtained the best ever observed optical light curve for any extragalactic object. They have monitored this blazar since fall 1993 and have collected over 2000 optical photometric observations. The light curve shows continuous activity down to timescales of tens of minutes, with amplitudes ranging from 0.1 to 2 magnitudes. The fastest observed activity was a 1.2 magnitude drop in less than a day and a 0.5 magnitude brightening in five hours.