A very brainy wheeze. Thank you, sir.

Brainy coves. Corky was one of the artists.

Jeeves was standing on the horizon, looking devilish brainy.

My idea was that we should pass the rest of the night slapping each other on the back across the wire, and telling each other what bally brainy conspirators we were, don't you know, and all that.

I'm not absolutely certain of my facts, but I rather fancy it's Shakespeare or, if not, it's some equally brainy lad who says that it's always just when a chappie is feeling particularly top hole, and more than usually braced with things in general that Fate sneaks up behind him with a bit of lead piping.