Very funny. Not just silly. I often cite this film as my favourite all time film. It took me time to watch it for the first time as it looked like a number of other films which are silly and claim to be hilarious but usually miss the point. This film nails it. The comedy is constant and is cleverly done with situations fitting nicely into the storyline which acts as the perfect vehicle for the perfect delivery of an amazing script. The Carrelly brothers other films are good too but usually have something uncomfortable in. Dumb and Dumber is their masterpiece. I can imagine them finishing it, then going over the script asking, "what else can we add to this joke to make it funnier?" A very difficult film to beat in comedy. I'm going to watch it again now.