For the first 15 minutes or so, "RRRrrrr!!!" feels fresh. Then you start to realize that most of its jokes are variations on the same joke: prehistoric people doing anachronistically modern things. It could have played around more with the "whodunit" aspect, but it refuses to do so - it shows you the murderer right at the moment of the murder. The film looks good, it has clever moments and at least one inspiredly surreal sequence (hint: supermarket), and Elise Larnicol is perfectly deadpan, but the comedy runs out of steam long before the end. Depardieu's participation is little more than an extended cameo. ** out of 4.