On the WaniKani Forums some people were posting about words they didn't expect existed. I thought this one was really good.
Definition: killing a passerby in order to test a new sword [jisho]
Break up the kanji and you get:
辻: crossing, crossroad
斬: beheading, kill, murder
I feel the most sorry for people who tested out their swords only to find that the quality was no good.