Viola Davis, his co-star in the play 'Fences,' visited 'The Tonight Show with Jay Leno' (weeknights, 11:35PM ET on NBC) last night and couldn't resist discussing the experience of working with Washington every night.

"Being on stage with Denzel Washington is its own theatre, because he is a reluctant sex symbol," Davis explained, going on to describe the way the women in the audience always responded to one of his most emotionally charged scenes.

"Every night when we were on stage, all you could hear was 'Mmm, mmm, baby, mmm!'" she demonstrated, but couldn't keep a straight face for long.