There was a school play where an actor forgot his lines. Instead of panicking, he started making up the most hilarious lines on the spot. The whole audience was in stitches. It was a great example of how mistakes can turn into something really funny at school.
There was this time when I was in high school. I was running late for class and as I rushed into the classroom, my backpack got caught on the doorknob. I was yanked back so hard that I fell over. All my books and papers went flying everywhere. The whole class was already seated and they all had a good laugh at my expense.
One funny moment is when Spiderman tries to imitate other superheroes' poses and fails spectacularly. Also, when he has comical misunderstandings with villains.
Once, my cat chased its own tail for a whole five minutes. It was so confused but also extremely hilarious. It spun around and around until it finally got dizzy and just plopped down on the floor.
The baby found dad's big shoes and tried to walk in them. The shoes were so big that the baby kept tripping over them. Mom started video - taping it, and they all watched it later and had a great laugh. It was a simple moment that added a lot of laughter to their family life.