Deze Nutz
My memory of this is hazy, but remember the episode where someone told Cooper a "deze nutz" joke and he, typically, didn't react, but obviously mulled it over and retold it to Dewey, who laughed uproariously, even causing Cooper to smile a little.
I thought it was a wonderful scene - showing Cooper maybe thinking about coming out of himself a touch, realising it's not a cardinal sin to have a laugh now and again, and also displaying Dewey's loveable heart-on-sleeve personality - he'd roar with laughter just to make the other person feel good, even if the joke wasn't funny.
I miss this show, and that kind of writing.