I'm pretty sure that the Weird Fish is the only object that is combinable with anything. I didn't know that you could combine the meat tendril with it, but every combination so far I've found involves the Weird Fish.
You can combine the pen with one of the junk passes
You can also combine the knife with cheese
Oh wow, I never knew this. I can now save 500 lol
(Recipe is ink pen + any bad passes)
(You require a quality counterfeit pass to activate)
