Charlie Tuttle (Jeff Daniels) is a partner in a successful law firm, Whitfield and Morris. His boss and future father-in-law sends him to Paradise Bluff, Nevada, to request a continuance in a mail-fraud case involving a cousin-in-law who is believed to be guilty, and is very likely to be adjudged guilty. But the timing of the trip conflicts with Charlie's bachelor party. After Charlie drives from California to Paradise Bluff, he is unexpectedly greeted by his best man, actor Richard Rjetti, (Michael Richards) who is determined to show his friend a great time prior to his wedding.

During the celebration, Charlie is knocked out in a barfight, and is later prescribed painkillers for the resulting pain. The next day — the day of the court appearance — Richard checks on his friend and finds Charlie has taken all of the pills in the bottle. Charlie winds up in no shape to appear in court that day, as legal counsel for con-artist Benny Gibbs (Rip Torn), so Richard impersonates Charlie. When the case unexpectedly goes to trial, Richard and Charlie must continue the charade, or they both will go to prison for perpetrating and conspiring to perpetrate a fraud upon the court.