Linus makes himself very helpful by ensuring no styrofoam container is ever abandoned on the kitchen counter. He will chew his way thru in numerous spots and then deposit the mess on the kitchen floor. He receives extra helpfulness points if little shards of styrofoam are scattered hither thither and yon.
They both are devoted to their duty of holding down the toilet seat lid whilst either of us are showering. That way they are at the perfect height to be groomed. Doesn't everyone keep an assortment of cat brushes on the back of the toilet??
Linus also patrols the well being of the showerer from between the shower curtain and the liner. But then he's "special" anyway.