It turns out Meryl Streep [1] can be as unpredictable in real life as she is in her blockbusters. During an appearance on The Graham Norton Show, the actress showed her affinity for her fellow guest Mark Ruffalo [2] with a passionate kiss [3] he's not about to forget. The surprise smooch came during a comedic discussion about the stereotypical roles Meryl was offered after she turned 40. It's been 25 years since the actress celebrated that milestone, and judging by her kissing skills and staple status at the Academy Awards [4], nobody has dared to hold her back. Check out Meryl and Mark's hilarious moment, above, and then catch up on the latest viral videos [5].