I've been boring people for years, pointing out a chord sequence that I hear repeated again and again in tons of different songs. Normally people just shrug or don't agree "No, it is different", etc...but now some clever sod has proved my point brilliantly for me with this fantastically-clever bit of YouTubery.
Check it out, and weep at our popstars' unoriginality.
http://www.youtube.com/watch?v=i4_f6pfabQk&eurl=http://www.b3ta.com/links/Four_Chords_36_Songs