Kernel Sandas wrote:
 > You are walking down the street and see a girl with a perfect body
 > and beautiful hair just ahead of you. You think she must be very
 > good looking and want to see her face. You think about hurrying on
 > ahead and sneaking a look back, or somehow making her turn round so
 > you can see her face. Anyway, somehow you manage to get a look at
 > her face and it turns out to be very plain or downright ugly.
 >
 > Someone once told me there was a word in Japanese for this situation.
 > If anyone knows the word or an english equivalent, please let me know.

What is your objective for this?  Do you want to insult the girl?  If 
you are a sensible person, you say "Excuse me" which is "Shitsurei 
shimashita" in Japanese.