In 1942, Bud Abbott and Lou Costello capitalized on their smashing success and churned out what is arguably their best effort up to that point. This time around, Bud and Lou play two dim-witted soda jerks trying to work their way into the radio business. When a "whodunit" mystery writer meets them and gives them tickets to that night's play, the duo jump at the opportunity. However, they soon find themselves in the middle of a real murder case when the studio's Executive Director is bumped off in the same manner as the victims in the mystery script. Thanks to one of Bud's bright ideas, they become prime suspects in the case while the murderer targets them as well. Trying to clear their names and solve the case, Bud and Lou embark on a wild chase that evokes laugh after laugh after laugh.
After seeing this film, it is not at all difficult to see why Abbott and Costello were so popular. Every routine is treated like a masterpiece and their comedic delivery is as close to perfect as you will find anywhere. Take the soda bar scene, for example. It's not that the "Muck and Mire" radio script is so inhumanly dumb, but rather Lou's constant heckling of the straight-faced bud that is funny. Then there is the way Lou reacts to everything. The man is just priceless. These guys had comedy nailed like few others ever managed.
Another reason Who Done It? is so great is the supporting cast. Sure Bud and Lou almost get in trouble for pretending to be cops, but it is a wonder that the real ones managed to keep their jobs for more than a day. Williams Bendix as Brannigan is even dumber than Lou! Now that is a first! His buddy is not too bright either. Sure, Bud and Lou nearly get in trouble for pretending to be cops, but the real ones are nearly as bad. Adding even more laughs is Mary Wickes as Juliet Collins. The subplot with her and Lou completes a one-two-three punch that is one of A&C's best ever.
Finally, there cannot be a great Abbott and Costello without a famous routine or two. The "volts are watts" scene is terrific, and who can forget "Alexander 2222"? For fans of Bud and Lou, the best part has to be when they hear "Who's on First?" on the radio and DISLIKE IT! The director managed to create a terrific flow from one wacky sequence to the next. For Bud and Lou in top form, look no further than Who Done It? Laughs guaranteed.
