>  Here's a little demo that does pretty much that

gracias!

>  (sparing the _ methods
>  like __send__):

no mercy! no survivors!

>  class Object
>     def mask
>       puts "I'm masking a method"
>     end
>  end
> 
>  class C
>     def x
>       puts "x"
>     end
> 
>     def y
>       puts "y"
>     end
>  end
> 
>  class D < C
>     def z
>       puts "z"
>     end
>  end
> 
>  class D
>     instance_methods.reject {|m| /^_/.match(m) }.each do |m|
>       alias_method m, :mask
>     end
>  end
> 
>  C.new.x   # x
>  D.new.x   # I'm masking a method
>  D.new.z   # I'm masking a method

I tried something very similar and it failed, but I can't recall why.
I'll check this later in the day.

-- 
Giles Bowkett

Blog: http://gilesbowkett.blogspot.com
Portfolio: http://www.gilesgoatboy.org