When Laverne and Shirley first debuted on Happy Days, little did anyone know that that supposed one off appearance would lead to a classic. Penny Marshall and Cindy Williams were perfect as the wild Laverne and the prissy Shirley. However, the rest of the cast deserves credit for this excellent slice of life comedy, especially Michael McKeon and David Lander as everyone's favorite losers Lenny and Squiggy. But the thing that made this show great was the fact that it was one of the all-time great slapsctick comedies.