Well, of course you can cry, but the real question is, will your tears fall? Canadian Space Agency Astronaut Chris Hadfield demonstrates the physics of tears in space in his latest educational video from the Canadian Space Agency YouTube channel.
And you thought post-cry raccoon eyes were bad. Try a giant blob of water on your face.
Also, doesn't the title of the video - "Tears in Space (Don't Fall)" - sound like it would make the perfect sulky breakup song? Maybe Hadfield can record it.