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kig just dropped this snip in the comments of the pipes discussion, which had morphed into a discussion about functional programming.

 class Fun < Proc
   def call(*args)
     if args.size < arity.abs and arity != -1
       Fun.new{|*a| call(*(args+a)) }
     else
       super
     end
   end
   alias_method :[], :call
 end

 def fun &block
   Fun.new &block
 end

 f = fun{|a, b, c| a * b / c }

 f[10, 20, 30] == f[10][20][30]
 #=> true

You can sort of curry methods with this, like so:

 class Turtle
   def draw *args
     fun { |x, y| ... }.call(*args)
   end
 end

But you will need to use the bracket syntax on the function returned by the method.