beep beep

I've had one of those, 'should never have started that...' moments. When I want Wiley to scoot over or move out of the way I say to him, "beep beep." Wiley, of course, has started saying to me "beep beep" while running my foot over with a truck/pushing me out of the way/trying to reach something I'm blocking. I've been trying to institute "excuse me" but that's not nearly so fun.