If they are talking about topics i am not interested in, I will do one of the following things
1)Plug in my earphones
2)Talk to someone who is not paying attention to them
3)Walk away
4)Pretend to know what they are talking about and laugh with them (I suck at this)
5)Go to the toilet
6)Give a uninterested look and look else where
7)Daydream

Do my own work