Stir Crazy is the best of the Gene Wilder/Richard Pryor movies. Having recently re-watched it I had forgotten just how funny it was. There are a number of brilliantly realised scenes, particularly in the prison, which for those who remember it from years ago will bring back very happy memories and for the younger generation will introduce you to the best movie comedy double act of the 1970's and 1980's. The highlight of the film is undoubtably Skip (Wilder) and Harry (Pryor) being led to their cell in the prison. Both are acting tough, cool and way over the top and both are hilarious.
Interestingly the two main stars were poles apart in their approach to comedy. Richard Pryor was (sadly deceased in 2005) primarily a brilliant stand-up comedian, whereas Gene Wilder is a brilliant comic actor. The combination of the two reached its peak with this sparkling comedy. The film is directed by Sidney Poiter, and aside from the scenes after the prison, where the film loses some momentum and the level of humour drops a notch, this is a film you can watch repeatedly because of the two brilliant lead performances.
In reality if you removed the two lead actors there really isn't much of a film left, hence I can't give it five stars, but because of the special chemistry that Pryor and Wilder had it certainly deserves 4 stars.