Dark Energy is the mysterious form of matter that probably hides behind the inflation of our Universe and the distortion on the shape of galaxies. It composes the 68 % of the mass of the Universe but till now nobody managed to detect it except for its super sneaky gravitational effects: that’s because it is just the best fricking ninja in History! 
Here is how it looks in a t-shirt!! (By the way, if you like the design you can help it becoming a real product by voting 5 on Treadless by this link: https://www.threadless.com/designs/dark-energy-is-the-best-ninja-ever)
