That is no mistake, there is real comedy in those games.
Best example of this is the plot of Discworld. Your Rincewind, a below average wizard with below average skills. Who has dreams of becoming a yak. Yes, and that is made clear very early in the game. It seems the Arch Chancellor for Unseen University, where you live, wants you to gather the parts to make a dragon detector. For it seems a dragon, has been turning some of the citizens of your town in to ashes. Which is only Act 1 of this 4 act game. Which then leads you to be apart of the conspiracy to raise the dragon in the first place, you make an effort to free the dragon from their control. It is only when we get to the last act where the dragon threatened your life the real comedy starts.
This game is filled with Red Herrings, who actually makes an appearance in the game's final act. Clues are obscure and a walk through is a MUST. Then throw in a love sick male dragon, and as it turns out the rampaging dragon turns out to be a female in heat, combined with a love custard pie. Yes, Love Custard Pie. Makes for rhe weirdest ending ever in any game I ever played.
Rincewind Voiced by Eric Idle, and featuring the talents of Jon Pertwee, Ron Bryon, Kate Robbins and Tony Robinson. Each character even though their dialog might be limited. Is very funny, you will be laughing at almost every line.
Then there is Discworld 2, Death is missing. Oh sure people are dying but they are becoming the living dead. It is your job, you find Death, and get him back to doing his job. Even if you try and make him a movie star, become Death yourself. Or even battling a female giant with sheep bladders. Think I am joking, just check out the walk through on any site. It's really that funny/weird. Also like the 1st game, filled with obscure clues and a walk through really helps here if you get stuck and you will be.
Okay the truth both the games can be frustrating, if your not using a walk through. That is why I suggest one. But every character has something funny to say and the cut scenes are pure fun, take in the original game where you have to get this guy's belt buckle. To do it, you use an octopus, a pot of love custard, and a pot a potty. The reason you figure you out. Then in the second they recreate of sorts the stoning scene from Life of Brain.
The only thing I can add is check out the game play vids on You Tube and see if you like it. I been a fan of both games since they came out in the 1990s.
Oh I almost forgot, there is a 3rd game it's called Discworld Noir. It's a comedy detective game it only came out in Europe and can be found where other PS1 ISOs can be found.