The Bickersons, with Alice Faye and Phil Harris, was one of my favorites. Of course Fred and Gracie, Lucy and Desi, Gleason and Meadows (Art Carney was a superb third member of the team) and Andy Griffith.
I can watch these reruns, but I don't follow a single one of the new situation comedies.
The old detective series being rerun also catch my attention.