1) Record a clip of your face, saying stuff. Keep your head as still as possible.
2) Using a video fx package (I use adobe after effects) Place 3 copies in the timeline.
3) on one copy draw a rough mask round the eyes
4) on the other copy draw a rough mask round the mouth
5) Turn the eyes and mouth clips upside down
6) stretch the mouth a bit sideways
7) Export to movie
8 ) Upload to youtube
Whole process takes about 15 mins (excluding recording your face)