What are some good challenges for YouTube videos?

Some engaging YouTube video challenges include the "24-Hour Challenge," where participants try to stay in a location for an entire day, and the "Whisper Challenge," where one person wears headphones and tries to guess what the other is saying. The "Try Not to Laugh Challenge" is also popular, where participants must keep a straight face while watching funny videos. Additionally, the "No Mirror Makeup Challenge" tests skills in applying makeup without using a mirror, making for entertaining and relatable content.