Nicolas Cage does not have an agent.
We're not going to blame the Japanese for the oddity of this ad. We believe this is all Nic Cage; just Cage being Cage. We imagine it went something like this:
Cage: Alright guys, I got this whole thing worked out. We start with me as a cowboy.
Japanese Ad Exec: Excuse me? I am honored you have agreed to endorse our product, but do you even know what product we're selling?
Cage: Hush, you're interrupting my process. So anyway, I'm a cowboy decked out in silk. A real frilly, silky cowboy with the rootin' tootins and all that stuff. Then I come upon some aliens.
Japanese Ad Exec: Aliens?
Cage: Aliens made of balls. And at first I'm all like, "What in tarnation?!" We're gonna fight, right? Intergalactic war. No! Instead we dance. They shake their balls and do their alien shuffle dance and I'm all like, "giddy up!"
Japanese Ad Exec: I'm afraid I don't-
Cage: I know what you're sayin', "Hey, Nicky Cage, all this silky cowboy and alien balls and dancin' sounds real faggy. But that's when we hit 'em with the switcharoo. I totally butch it up at the end by head butting the head ball alien guy, right in the ball!
Japanese Ad Exec: Uh, thank you for your creative input, but we only have one day to shoot and don't have any of those things.
Cage: No worries, I already filmed it.
Japanese Ad Exec: You what?
Cage: (galloping away on a stick horse) Yahoo! Giddy up! Whaoooo!