"De-TEC-tive Munch!" Yeah.
How about Joe Flaherty in Freaks and Geeks. Yes, I know F&G is supposed to be a comedy, BUT I think Flaherty plays the father pretty straight. Check out the episode where Lindsey smashes up the family car... Flaherty is rock solid.
...I just remembered! Much as I hate to admit this, Robin Williams had a guest role in an early episode of Homicide, and he was good. He played a tourist whose wife gets shot.