to lie on sb`s liver
For worries to lie heavily on someone?
to lie on sb`s heart.
Something is very important and is a concern to somebody?
to be the brain of sth
I think this is the equivalent of the English term 'to be the brains behind something' e.g a plan
Somebody is a vein - Someone tightfisted, miserly?
PS, I think your idea of PF being a perfect representation of a typical society is true, but on here it just seems like the crazies stand out more ;)