talk against me begind my back

There is something very funny in the story that happen to me, can you find it?
One day, my classmate came into my dormitory and said," Hey man, do you know that stupid girl talked against me behind my back. She is so stupid."
My roommate and I laughed.

take a shower

When I was almost 5 years old, something funny and incredible happened in the bathroom.
At that time, I was taking a shower with my father. In our bathroom, there was a stool for relax. On the other hand, there was also a body wash with press-on opening.

Then I regarded body wash as the stool and sat on it.
"Oh~~~~~~~~~~~~~~!!"
After that, I got out the bath room with pain.
At night, I farted, with soap-bubble and perfume of body wash.