I have never spoken to anyone on Skype.
So if you would like to speak with me, click on the white tick on the green background, under my avatar.
You may not want to put your fingers anywhere near my avatar, quite understandably, but notice he is looking to your right. So if you take your mouse in your left hand and very slowly move it towards the white tick on the green background, he may not see you.
At this point, click quickly and escape.