I'm still just a third year student, but have already seen some pretty weird stuff. Just the other day, we had a 94 year old man (Full code!) who kept going into periods of asystole after his surgery...fully conscious, talking, just pulseless! He did it about 5 times in the recovery room alone, in front of the cardiologists, no less. Once he was on the unit, he kept everybody "entertained" by doing it again and again. Turns out all you had to do to get him started again was to kick his bed.