For me, one scene that stands out is the one in "Troubled Waters". Nothing fancy---just a beautiful whiskey (bourbon?) on the rocks that Columbo keeps raising to his lips and never drinking. He must have done it five times.

At the end of the scene, he leaves, never having taken a sip, and thanks Danzinger for the drink. Robert Vaughn looks at the drink, and mutters something like "my pleasure."

Such a waste!

Absolutely "Murder Under Glass" makes me ravenous! It's not even the banquet at the end. It's all of the food that Columbo eats from the very start of the episode. But I always crave the crab-stuffed mushrooms, first and foremost.