Optional parens are great for building DSLs and bad for everything else. As a rule of a thumb, I don't omit parens outside macros like `before_filter :smth` or

Optional parens are great for building DSLs and bad for everything else. As a rule of a thumb, I don't omit parens outside macros like `before_filter :smth` or `validates_presence_of :smth` or RSpec DSL `it "should ..." do`.