"ducha escocesa"
Here's the phrase, it's from an article in todays Periodico about the perennial Catalan/Castillano conflict but that's not my concern... here's the interesting phrase I have never heard before, maybe I should say phrase hecha:
. va a tener mas de ducha escocesa que de balsa de aciete
Is anyone familiar with this phrase? I'm fascinated 
3 Answers
It will stir things up instead of calming them down.
Hmmmm, never heard of one, but there is a line in Wikipedia:
Basically a Scottish shower consists in alternating application of hot and cold water during a shower session. In the most reduced form, it may consist only of one alternation, that is, applying cold water after a usual hot water shower. It is thought that the alternation of heat and cold improves blood circulation, that is beneficial for instance in rheumatic disorders. The application of cold after heat is well documented in the sauna article section: Health risks and benefits/with cold exposure.
Hope that helps some! 
And the latter part has a figurative meaning (from our dictionary):
ser una balsa de aceite (figurative) -> to be as calm as a millpond
So implying serenity and tranquility.... 
