There's a mall we shop in that has something similar to this thing here. I always tell my wife, that darn-it, she's gotta remind me to bring the camera next time so she can take a picture of me 'behind' the horse, who's wearing an even more pained expression than this one.
The pay off is the disgusted tsk-tsk look that I get, everytime.
Have you ever seen the "funny tourist photos" that have been emailed around from time to time? There are several that are similar to what you just described.
Go here
http://www.jibjab.com/jokebox/jokebox/jibjab/id/299895/jokeid/60523