If you're unfamiliar with the plot of this movie, Tom Cruise plays an American military officer who is training Japanese soldiers in the 1870s and eventually embraces the samurai culture. It's basically Dances With Wolves, but with katanas instead of tatonkas.
Anyhoo, my friend went to this movie in the theatre. During the first scene in which our hero dons traditional samurai garb, there was a startled outburst from several rows back.
"What the -- I didn't know Tom Cruise was Chinese!"