I have many favorites. Here are just a few:
Drive! She Said - where Shirley teaches Laverne to drive.
The Stakeout - where 2 FBI agents stay in the girls apartment.
Honeymoon Hotel - Shirley wins a honeymoon vacation but she isn't married.
Laverne & Shirley Meet Fabian - The girls dress up as maids to meet Fabian.
Playing Hookey - where the girls play hookey from work.
Playing The Roxy - Shirley hits her head and believes she's a stripper named Roxy.
Airport 59 - Where Laverne has to fly the plane after the pilot hit's his head & passes out.