The T-shirt that folds itself
Lay the T-shirt flat and face up. Pinch it with your left hand at point A and with your right hand at point B. Holding on to the T-shirt, move your right hand over the left hand to grab the hem of the T-shirt at point C. Keep pinching with your right hand. Lift up the T-shirt, and pull your hand out. (Uncross your hands). Shake it out a little, then lay it face down, still holding it with both hands. Lift both hands and fold it back so the neckline is in the centre. Here are some videos that show you how:

http://www.youtube.com/watch?v=eZ7Lawiw84g&NR=1
(very clear American boy)

http://www.youtube.com/watch?v=vD6zs9j9QI4&feature=related
(good visuals, no English)

http://www.youtube.com/watch?v=fvNUdcDtTwo&NR=1
(good visuals, no English)

http://www.youtube.com/watch?v=wTPkSJR5i0U&NR=1
(Australian)

http://www.youtube.com/watch?v=kacQlt7zsQY
(good visuals, no English)