There's a story about a dog who chased its own tail so vigorously that it got dizzy and fell over. It was really funny to watch as it then just lay there looking confused.
Once I went to a job interview. I was so nervous that when the interviewer asked me to introduce myself, I completely forgot my name for a few seconds. I just stood there with a blank face. Then I stuttered out my name and felt my face turn bright red. It was so embarrassing but now it makes me laugh.
My cousin was at a big family picnic. He ate a whole lot of different things that didn't quite mix well in his stomach. When diarrhea hit him, he thought he could make it to the house bathroom. But as he was running, he let out a little squeak with every step. By the time he got to the bathroom, everyone at the picnic was in stitches, including himself once he was done.
A cat once chased its own tail for hours. It was like it had discovered the most interesting thing in the world. Its owner watched in amusement as the cat spun around and around.
You can find them in some joke books. There are many collections specifically dedicated to short and hilarious stories. For example, 'The Big Book of Funny Stories' might be a good start.
Sure. Once a man went to the doctor and said, 'Doctor, I think I'm a bell.' The doctor was puzzled and asked, 'Why do you think that?' The man replied, 'Because when I touch my head, I go ding - dong!'
There was a little boy who loved to ask questions. One day he asked his father, 'Dad, why do they call it rush hour when nothing moves?'. His father was stumped for a while and then they both had a good laugh. It's these simple, innocent and humorous situations that make for great clean stories.
One really scary story is 'The Tell - Tale Heart' by Edgar Allan Poe. It's about a man who kills an old man because he can't stand the old man's vulture - like eye. After hiding the body under the floorboards, he starts to hear the heartbeat of the dead man, which drives him to insanity. It's scary because it shows how guilt can haunt a person.