[the invisib1e hand]

Let's not forget that great theme by the one and only Q.

[Eye On The Left]

It's still on my top 5 or 10 sitcoms ever list. Especially when 'Fred' was in his prime. Later on the series stunk. He became a different character altogether. Big ego took over and he wasn't very funny at all. 'Lamont', I think, was underrated. He actually was a terrific straight man for Fred, yet often very funny himself. Others on the list include:

Abbott and Costello (tv series w/ Mike the cop, Mr Fields and Stinky)
Honeymooners
Andy Griffith (w/ Don Knotts)
Green Acres
Odd Couple (Randall and Klugman)