For this new trick I use the command "there's something on your nose". It took us two sessions to figure it out, the way to do it was to put a very small piece of duct tape on his nose, and have very high value rewards, so he didn't focus too much on the tape. That way it was a lot easier to fade the tape, since he was more aware of the behaviour than getting rid of the tape (due to good treats).
I'm not all pleased with it yet, I want better stimulus control, but I think this'll do for our little competition, won't it, Lene? Since it's all about being first (to avoid paying for the next cup of coffee) I decided to post it as soon as I had anything that matched the criteria :-)