Answer: 1. Videos of silliness. 2. Some repeated behaviors cause laughter. 3. Jokes are not the only reason for laugher.
Explanation: Something that is amusing for someone may not be that funny for other ones. Videos of silliness can be fun to watch because of their simpleness. However, others might think it's nonsense. Repeated behaviors cause laughter for some, but others may think it was predictable and absurd. Jokes are not the only reason for laughter since some people may love the simplicity of them, but other ones can't solve the 'cognitive riddle' in them; hence, they get confused. That is the reason why understanding what triggers laughter is complicated.
