Brown woolly bugger
This is my favourite. I have absolute confidence in this fly and it’s my default point fly in fly fishing competitions. That of course doesn’t mean that I don’t fish other woolly buggers or woolly bugger variations with specific applications in particular fisheries but it does mean that if the buggers that should work (eg a Magoo in Purrumbete or a Tassi bugger in Arthurs lake) isn’t working then I will always give my brown bugger a swim.