I don't think that will work in court...
"It's people who kill, not guns"- America.
good excuse :)
Why is "It was the knife which did it, not me" wrong?
I think you have a mistake in the notes. There you say "der" can only be used as an object, but here it is a subject. Did you confuse subject and object there?
the knife is the object
Wait a minute... the object/subject thing refers to the main clause, not the subclause? How confusing!
Your honor, I swear...
Mack the Knife!
Finally a useful phrase!