answer:My husband laughs so loud when watching TV you can probably hear him two apartments over. I probably laugh a little more when I’m with someone else watching TV, because if I miss a joke their laughter might clue me in. Also, with my husband, sometimes I am laughing at how hard he is laughing. It just makes me giggle that he is so entertained. This happens when I watch with my mom too. I do laugh on my own though too. Not only watching TV, but in other situations laughter can be infectious, no question.