Find the best Shelf: - The Kid's Show comedy tickets at Cavendish Square, Inner London. Shelf are a musical comedy double act. Sort of. One of them is tone-deaf, so technically they're a musical single act plus guest. A kids' comedy show for all the family, full of sketches, songs, pranks and silliness. Best friends Rachel and Ruby use physical comedy and silly characters to bring sketch comedy to children of all ages - a fun way to explore emotions, friendship and shyness.