Somebody once said after hearing a witty remark, I wish I had said that, the response, one day you will. Seriously I envy some of the very inventive usernames, wish I had taken more time in choosing. Having said that it's a pest when screen says, unavailable. Sir.prize is classic.
Just out of interest, the situation above arose when Oscar Wilde complimented the artist James Whistler on something witty he'd said by saying, "I wish I'd said that." Whistler replied, "You will, Oscar, you will."