This is an irregular feature - both in frequency and oddness - dedicated to a word I came across that I have never previously used.
funambulist, n. A word used to describe a tight-rope walker or rope dancer.
The term is derived from the Latin words "Funis" (rope) and "ambulare" (to walk). Apparently this behavior, which we associate with the circus, was a popular form of entertainment in Roman times as well.
The term can also be used to describe someone who displays agility in feats of mental prowess.