SHM also does that in their shows. i can tell you: people will lose their sh*t when doing that. here one (no pun intented) example i witnessed myself on NYE 2011:
skip to around 3:10 and let it play from there
[youtube]vC-SGz1In_k[/youtube]
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Ill let you know when they do it tonight at the garden....
It just sounds sick! Another one of my personal favourites happened when I got a request for Katy Perry- California Gurls (It was her bday so i had to) I mixed that out to Fedde Le Grand's Put Your Hands Up. There's one part in the Katy Perry song where she says put your hands up, and fedde says the same thing, so I just ran those two loops at the same time and just cross faded it. I'll record it when I get home
Here it is, sorry for delay, I'm currently on finals, and I just got some free time now. And I have so many mashups I have ready I just need to put together, I just haven't had the time. But after tomorrow at noon, it's just going to be me, my laptop and my DJ equiptment for 3 weeks :)