Renetto finds himself in a cathedral at the holidays, and is impelled to sing because he likes the sound of his own voice (which is very good). And, perhaps, because of the wonderful acoustics. He films himself quite close up, singing "Silent Night" acapella. It makes a very nice Christmas (or Hannakuh, if you'll excuse the Jesus reference) card.
Diet Coke and Mentos has taken over the YouTube world. There are many permutations, attempts and explanations for the whole Diet Coke/Mentos phemenon. This video is an apology for Renatto’s previous human experiment video, where he appeared to be sick. It was all a big joke. Honestly. Just a joke. Paul replicates the experiment to prove it was all a big joke. Truly. Trust me. It was just a joke.