By hotmixing a pile of tunes I have never heard before.
I really enjoy this, mainly for the fact I get as many surprises as someone else listening to the set for the first time!
There is even what, on the drop, to my horror, sounds like and Electro-House track...
Link
On an aside - do any other DJ's round here get a head-rush when a mix comes together just right? Like you are coming up on one?