Pfff … nice ones.
1) Set the record stop (you know the sound like when you stop a record player) so the sound slowly ends (also lowers in pitch, when you hit stop on the out deck, turn the filter knob so it’s at base heavy (low pass). Hit play on the in deck with the fader up, as the “record”slows to an end, bring up the filter simultaneously.
2) If you realize immeditately what you did (and have the next track ready) just keep hitting cue in the beat (or double-tempo or whatever sounds halfway decent. Throw in some big effect and just slam on the new track.
3) Grab the mic, bring both track faders back to half, ask for a big cheer for your 5-year old nephews first attempt at beat-matching, grinning like you were born yesterday. In the meantime you have fade out the out track and the in track is playing at half fader. As you finish talking just run up the fader on the in track.
There are a zillion options, these are the ones that don’t require too much thinking (although you need to know your effects well to do 2 properly), but in todays software so much more is possible.
I am sure you will get many more creative (and hopefully more useful) tips.
Greetinx,
C.