The Simpsons. Its fucking iconic at this point.

That 70's Show. A group of people that have almost effortless chemistry between them, and Red and Kitty are perfectly played parents.

It's Always Sunny In Philadelphia. Another group of effortlessly charming people playing the WORST of humanity.

Community. Its streets ahead.

I think of a Mount Rushmore I think what shows could I watch anytime and be amused by something...simpsons gets the pass on that because with 700+ episodes there are bound to be some bad episodes.