I believe that, in the stable at least, N.P.C.s will barter for cash cards according to the card’s stored value and can magically send excess barter values to your account.
There should be mass graves. maybe three flavours, the first just inflicts, say, -20 morale when you first see it and then an extra -2 every 100 ticks with no upper limit…
Type two randomly spawns jabberwoks.
Type three the whole thing has just fused into a giant immobile zed. If you touch it, you get sucked in and subjected to… large… amounts of damage. Of course, it being immobile, you can just throw a few molotovs in, but the smell is not good for your health or morale…
There should be crashed bombers with maxi-nukes on board.
There should be an option to climb on top of turrets and laugh as they flail around trying to knock you off.
There should be an option to climb onto hulks and lead them around by putting some sort of zed-viable critter on a stick and holding it out of reach.
It should be possible to stick a zed-viable critter on a spear and then throw the spear into a hulk. The spear would stick, the critter would be out of reach, and the hulk would run off into the distance…
There should be invisible lasers set up around labs, just running perpetually. If you make a crazy-high perception check, then you notice the smell of ozone, but have no idea where it is coming from. If you walk through it then your torso becomes a collection.
You should be able to stick zombies on spikes and mount them around the place, it would attract some things and ward off other things…
There should be a 50/50 chance of taking a huge morale penalty or bonus when you open a latrine due to it being designated for the incorrect gender. Doubly so if there is a zed in there…
Fancy items should be addictive.
It should be possible to activate tin cans to crush them against your forehead. It lowers their volume, or maybe converts them into metal chunks. It also increases your morale but also lowers your intelligence if it is above a certain value.
There should be a limbo skill, get it over 50 and you can limbo under steel doors.
If you get barter to 50 you should be able to buy installed C.B.M.s and human blood from N.P.C.s.
Cats should spout memes like horrors spout nonsense. Also, cats should be convertible into items, which have the same actions as grappling hooks, alarm clocks, noisemakers, M.P.3 players, cutting tools, butchering tools, and helmets.
If an N.P.C. throws sand at you, and you immediately drink a protein shake, then you should permanently gain 10 strength.
If you have a pit with pits on the two zed levels above it, then it should fill up with lemming zeds.
If you have a talking doll and you get wet, then the doll should get wet, and it should leave puddles all over the place until it dries.
There should be a trait that makes you obsessive about the purity of your bodily fluids. If you read a book about fluoridation then you should become comatose for three days.
It should be possible to craft a seat onto a mininuke. If you fire it, then you should be teleported to the detonation point just prior to detonation and receive a massive morale bonus.