Card #057 Barney and Thelma Lou's courtship ritual:

Sunday - church services
Tuesday - her place for TV
Thursday - the diner for the special
Friday - Coffee* at the courhouse (Barney's on duty)
Saturday - picnic, dance or movie double-date with Andy and Helen.

*Apparently, Barney likes a little sugar with his courthouse coffee (scene from "Up in Barney's Room," Episode #104).