Delbert in Arachnophobia is the role him and his personality were tailor-made for. I know he was arguably born to play Fred Flintstone but god that movie was terrible and such a waste of his perfect Fred Flintstone impression. Otherwise that's such a tough question because he's legitimately one of the most underrated actors of the past 50 or so years. Raising Arizona, Matinee, The Big Lebowski, 10 Cloverfield Lane (holy shit he is awesome in that) are all big favorites but really, he's kind of a deal where no matter how shitty the movie is, once you see him in it it immediately improves the quality of said movie. That's rare air that I only put people like Burgess Meredith in.