Good old Spike Jones. You never knew what he and his band would come up with next. Years ago I recall a local D.J. in the Bay Area who followed Spike Jones' career. He said one year during the band's public appearances they hired a grandmotherly-type lady who sat in the middle of band, knitting while the band performed. That's all she did. She didn't play instruments or perform in any sketches. Jones did this knowing the audience was expecting the lady to do something, which she never did. It drove the audience nuts.

I clicked the Yahoo link "E" posted and watched Harpo Marx as Jones' guest for the evening. You can hear Marx laugh out loud, which is about the only time the public heard him say anything vocal on stage.