Block That Metaphor

I'd have to say Hilton Als' comparison in his review of The Importance Of Being Earnest is more startling than insightful:

[Lynn] Redgrave [as Lady Bracknell takes] charge of her role with the single-minded aggression of the lone fag hag in a gay bar.

(The actual sentence is quite a bit longer, but it's only the last half that I care about.)