As someone who started programming in ML and later in Prolog, they are far from weird. Other than that, they are not a "strange language feature", they don't b

As someone who started programming in ML and later in Prolog, they are far from weird. Other than that, they are not a "strange language feature", they don't behave in unexpected or unclear ways. While `!` is certainly a very special piece of erlang, its also not strange as well, as in say.... Ruby flipflops?