You grabbed a lion's tail. The moment you hooked the lion's tail onto the back of your pants, a fantastic change took hold of you. Golden light swirled all around you like a raging tornado. You could feel the tail become a part of you, continuing on from the base of your spine. The tail flicked around autonomously as you felt your hair grow out into a bushy mane and turn a rusty orange. Your fingernails grew out into claws as your body grew in taller and developed some fantastic muscles. Your feet grew out, destroying your shoes and leaving you with clawed toes. The clothes on your back ripped apart as your muscles grew in, and you could feel them transforming into a large, war-torn loincloth. A necklace made with large wooden beads was hung on your neck, and you were given bracelets and anklets to match. You could feel your pupils take on a distinctive catlike shape as your irises turned yellow and red. You could feel mighty fangs growing inside your mouth, similar to a lion's. Your ears migrated to the top of your head and morphed into the shape of a lion's ears. You watched your skin tan out as black tribal tattoos ran up and down your arms.
By the time your transformation was complete, you had become a lion-man. You felt strong, confidant, ambitious... as though you truly could become the literal King of the World!
Uncle Jack had better have prepared meat.