Have some fun probably. These calls turn out to be your chance to do something different that your busy schedule doesn't allow you to do; as we know its all about evolving. All work and no play makes Jack a dull boy. Why be that Jack anyway! So here are a few things you can do while being bored to death on such calls; chat with your latest crush or love interest at work (make sure its not an explicitly-romantic conversation if you are talking on the office communicator, if it is, use your mobile. I am sure you know what I mean.), check out that cute, hot guy or girl on your floor - within your visible reach of-course (some may find themselves unlucky in this regard, I know you feel too bad about it), Facebook and Twitter are age-old options; not sure if you are bored of these too, shop online (now this is the most expensive thing to do on a boring call, unless you have a fat salary and love to shop), if you are using headphones for your call then you can stretch the wire and chit-chat with your colleague/s sitting next to you or a couple of desks away, and crack a few jokes (make sure the mute button on your phone is on or else you will end up being a joke yourself), start a group chat with your colleagues who are on the same call to check if they are also bored (make sure you don’t involve your boss in that chat, you know why, don't you) or may be you would just like to sit back and read an interesting article or blog on the internet.
While I write this on a boring conference call, I hope you make time to read it during one such call.