Singing, musical instrument, drawing, digital graphic design, programming, electronics, web design, writing, knitting, gardening, woodworking, origami, chess, dancing, any sport, foreign language, history, sciences, cooking, math, cooking meth, photography, handicraft, filming and video editing, improv acting, MS Office suite (Excel, PP, Word, ...)

Or find something that's not as good as it could be, and improve it.