This week's Trends: contraptions, rainbows, and Harry P

Each weekday, we at YouTube Trends take a look at the most interesting videos and cultural phenomena on YouTube as they develop. We want take a moment to highlight some of what we've come across this week:

• We reviewed the most-watched Harry Potter fan-videos of all time.
  
  
• We uncovered the most-viewed Rube Goldberg machines on YouTube.
  
  
• We saw some cool and funny moments and ads from around the world.
  
  
• We asked if Grand Rapids, Michigan is becoming the U.S. capital for lip-dubs.
  
  
• We grew concerned about some pets that were now plotting and executing daring escapes.
  
  
• We celebrated the one-year anniversary of a famous Double Rainbow going viral.
  
  
• We highlighted the latest footage from demonstrations in Malaysia and Syria.
  
  
• And we saw LOTS of new Harry Potter parodies and music videos popping up. Here's one of the popular ones:

Check back every day for the latest about what's trending on YouTube at: www.YouTube.com/TrendsKevin Allocca, YouTube Trends Manager, recently watched "Clark Retirement Community LipDub" for like, the 20th time.