I've read Hitchiker's Guide and I am currently reading Shaggy Planet. Both are what I would call Dark Comedy. This is a genre that is almost never seen in rpg-ing.
Well, there is Retief (he's the one competent member of the Terran Diplomatic Corp in a universe of often aggressive aliens, and backed up by bosses who range from the not quite getting it to the completely clueless and selfish. There are occasionally decent aliens...who tend to get abused also.) But Retief doesn't really fit because he's smart...unless you say Retief is a verser and its only indigs that are powerblocked from being competent.
How to do it:
1. Nobody seems to get truly enraged in these stories. I'm going to powerblock 'Fury'. In other words, you can't lose your temper, or stay coldly furious in these worlds.
You can be irritated, peeved, and annoyed, but righteous wrath just doesn't fit this genre.
Tadeusz would have a problem in this world.
2. Most people seem to be rather not quite competent. Thus all attributes above 1@10 and all skills above 1@10 are powerblocked.
This helps with the kind of befuddled, I'm sorta making up this as I go along atmosphere. No one has deep interior logic (no C.S. Lewis's) or profound spiritual calm. Also, thoughtful well-reasoned plans are right out.
3. No one has to work really that hard. It tends to be very high tech with robots. These people would tend to need robots around to do the jobs they are not competent to handle.
However such robots tend to be intelligent entitities with personality quirks. Marvin the Smartest Being in the universe naturally comes to mind.
You may consider Marvin an exception to the rule of IQ blocks, but based on his primary behaviour, I'm going to judge Marvin as that sort of lazy, know-it-all who doesn't really know that much at all who is happy to tell you just how brilliant they are with their woefully unconsidered opinions.
I might be wrong. Its been a long time since I read the books, but it fits with what I'm making here.
4. Lots of sudden and rather strange action. People get tossed off airships, have planets explode under them, get shot out of the sky because a cult of machine worshippers wants to eat them and worship their aircar....
Every few hours roll a 3d10. On a 'fifteen' a homicidal waitress tries to poison them to use their body for supper time steaks. On a roll of '30' the planet explodes with three minutes warning because a hyperdrive starship driven by a drunken Fox-girl (a fox genetically transformed into an intelligent being) crashes into the planet at 100X lightspeed.
5. Sapient beings with rather strange outlooks...either aliens, or genetically transformed humans or animals are common.
A. This needs to be rewritten to be better layed out.
B. If these stipulations make sense, a world based on them should be created.
EDIT: Let me add that the average attribute score in this world is 1@3.
One effect of this is there are no real leaders exemplars in any endeavor. There are no saintly sorts, no masters of logic, no Mona Lisa serene smiles...and a lot of people learn how to do things by watching those more successful at it. And a lot of the innovation in society comes from the best capable.
Nobody expects the leaders that do exist to demonstrate more than middling competence.
One other interesting effect, if you want to do this, send someone...like the Alchemist or Tadeusz with their high stats, high skills to this world, and strip them down to 1@10, and then watch them bumble about...