Possible one of the most intriguing Tillandsia, T. flexuosa viva-parva does exactly what its name implies! As the plant matures, the base will begin to spiral. It looks as if you held both ends and twisted. It's such a neat air plant! Be sure to keep the relative humidity high for peak twisting performance.
This species also happens to be one that can be easily grown in a bromeliad soil mix. They tend to grow a bit faster when grown this way.