Ordinarily getting this effect is no big deal... Go out find a dimly lit scene with water, put your camera on a tripod, set the apature to a really big number and push the shutter button. Easy!
Just for kicks while in Waikiki I thought I would try a slow water scene hand held in full bright daylight. (I must have been bored or something). So I set the ISO as low as it would go, set the apature as high as it would go, held my breath and gingerly pushed the shutter button. A few moments later the shutter closed shut and I had a blury mess!
Not one to back down from an interesting personal challenge I tried again, and finally on the 4th or 5th shot I got this! Not much of a picture really but makes for a good story.