“Stepping in my piano”

The phrase "The baron […] has a regrettable habit of stepping in my piano", used by Countess Alcydia in the comic named after her attracted some comment on the RoCR forum. No, I don’t know where it comes from either; presumably it’s a Norwegianism. It’s a wonderful expression nonetheless, one of those that need no further explanation, and one that the English language really needs. I would like to take the time to urge you all to use it in conversation at the earliest opportunity.