Front him up.
Remind him it was your idea.

Don't be too nice about it either.
(Set your faces to Stunned Bigly, Wed 13 Apr 2011, 10:34, 2 replies, latest was 15 years ago)

This^
Cheeky bastard
( sporters I’m sincerely gratitude to you, Wed 13 Apr 2011, 10:35, Reply)

He's 73 years old
and a character. Everybody adores him. I'm the new "young lady" of the office. They'll never believe me. At most, they'll think he didn't hear me when I said it and had the idea of his own.
(Aberracion Life's getting very complicated, but a lot of fun., Wed 13 Apr 2011, 10:36, Reply)

that's still no excuse
you'll have to drop it subtly into conversation with the boss: 'XXX tells me you liked my idea about A,B,C. I'm glad I mentioned it to him.'

Alternatively, start very minutely moving his stuff, claiming you can't see or hear certain things that he can, and make him think he is losing his mind. Or slash his tyres.
( b3th Not shit. Not mod., Wed 13 Apr 2011, 10:39, Reply)

*applause*

( Monty Boyce, My cheese game is strong, Wed 13 Apr 2011, 10:45, Reply)

I'm guessing you mean the mindfuck idea
rather than the sensible 'talk to your boss' idea?
( b3th Not shit. Not mod., Wed 13 Apr 2011, 10:53, Reply)

He comes by train
but I'll do that moving things around bit. Sounds like fun anyway.
(Aberracion Life's getting very complicated, but a lot of fun., Wed 13 Apr 2011, 10:52, Reply)

I am liking your work more and more

( Vipros. clever got me this far, then tricky got me in, Wed 13 Apr 2011, 10:54, Reply)

I really can be cruel and devious
when I need to.
( b3th Not shit. Not mod., Wed 13 Apr 2011, 10:56, Reply)

good stuff

( Vipros. clever got me this far, then tricky got me in, Wed 13 Apr 2011, 10:56, Reply)

Let him know you think what he did was wrong and leave it.

( girlinthehole, Wed 13 Apr 2011, 10:41, Reply)

You work with Monty?

(Darth Foxtrot A one-man army dedicated to making fetch happen, Wed 13 Apr 2011, 10:41, Reply)