I see that Obi-Wan has taught you how to glow in the dark well, young Skywalker! The 100% cotton Star Wars Lego Vader Threat Kids T-Shirt has a Lego-ized version of Darth Vader commenting on Obi-Wan's rather fine teaching skills. Vader is probably referring to Obi-Wan's 'How to use a Yo-Yo Ball' class. Do they even make those anymore? Still, the Star Wars Lego Vader Threat Kids T-Shirt is a great shirt for the littl-lins who fancy Star Wars and 'glowy' attributes.