timppu: I have no idea if some idioms are also used elsewhere, but e.g.:
"Toimii kuin junan vessa." = "Works like a train toilet."
Means basically the same as "Works like a clockwork.", ie. something works perfectly and as expected.
I have no idea if train toilets really are that dependable as the idiom states. Maybe it is referring to the old kind of simple train toilets which just flushed all the feces and nice stuff onto the train track, ie. there was no plumbing or anything that could get broken.
I like to say the idiom in a form of "Smells like a train toilet.", that I can at least understand.
That is certainly unexpected inspiration for a saying.
My favorite one I heard here was something like, "I don't want to be a stone on anyone's foot"
A friend of mine once told someone from out of the states "Goodnight, and don't let the bed bugs bite," and he got super pissed thinking she was implying he was dirty and one could expect to find bugs in his bed.
Telika: I... know SOMEONE who has used a version of this as a title for his research on routine corruption.
JudasIscariot: Yeah, basically that idiom kind of alludes that if an organization is corrupt it usually stems from the top :)
I like it. Makes good sense. Better than some do for sure.