Found this in a three-day old culture of dried grass and tap water.
Pretty much stayed in one place, rotating every few seconds. At one point, it began 'vibrating' very rapidly for about 10 minutes, and then resumed its turning behavior.
It has a 'Moustach', which remindes me of a Spirochaeta, but its behavior is different (as well as its shape).
Notice the two large circular objects, which I had originally thought were two nucleus, and perhaps the critter was getting ready to divide, but after about 20 mins. of observation, there was no change in its body structure.