we knew xss as cross site scripting
but here is a different case it called(cross skype scripting) LOL
When i share url between me and my friend on skype for an example about XSS i got alert message fired from skype and my friend has the same message appear on his screen.
here is the way to reproduce it . copy and paste the below url and send it for one of ur friend on skype .
http://example.com/?startDate=2011-03-01§ionId=1"><script>alert(document.body.innerHTML);</script>