Gimme a "U"

This was a commission - I don't usually take on commissions because it always takes me forever to find the time to do them, and so I tend to wait until I've finished the current one before taking on the next. (I'm getting through about one a year at the moment, so please don't ask...) Anyway, I managed to finish this one before continental drift changed my address. The guy wanted a picture involving the letter "U" and some word that began with it. Never one to hold back from thrashing a theme into the ground, and deep within my Fred the Clown period at that point, this is what I came up with.