The one they show on this site? That looks nothing like the movie!
It smells like a Bible story in here!
Yeah, it's dreadful.
You think you’re smart, but you’re not. You’re dumb. Very dumb. But you’ve met your match in me!
It's not even FROM the movie!
share*EDIT*
You know, for some reason it actually is from the movie. How they came up with this scheme is beyond me. Have a look;
http://www.imdb.com/media/rm1948563968/tt0107616
I always think the woman on the poster is Meg Ryan wearing a mask. At least that's what it looks like. Whoever manages these things should change the poster to one of these two:
http://www.impawards.com/1993/posters/much_ado_about_nothing_xlg.jpg
or
http://image.tmdb.org/t/p/original/tFyOY0GC8vQuODpyLLzoBmAghzF.jpg