Although Scheme's question mark for predicates has had influence in other languages -- besides Clojure, it shows up in Ruby, for example. And for head/tail vers

Although Scheme's question mark for predicates has had influence in other languages -- besides Clojure, it shows up in Ruby, for example. And for head/tail versus first/rest, I don't really mind either one, but head/tail is pretty strange if you haven't seen it already -- it makes the programmer imagine that their data is some sort of animal that needs to be beheaded (or is it supposed to to be the head and tail of a coin?)