Two swallows chasing a fly.
One of them:
“It will rain soon.”
“How do you know?” – asked the other.
“Well, that guy over there said it would rain because we are flying low.”

Porky pig and Yogi bear back to school after the long summer break.
The teacher:
“Listen kids, today you are going to write an essay – What I did last summer.”
Porky to Yogi:
“What the hell am I going to write!? All summer we were stoned, that’s all we were doing.”
Yogi:
“Look buddy, it’s simple – all you need to do is … replace the word ‘smoked’ with ‘read’ and so on … and you’ll be fine.”
Three days after, the teacher checks Porky’s essay:
“My usual day – woke up and started to read straight away. Then went to the bathroom. It was difficult to read in the shower, so I left the book on the bench. After breakfast I did some more reading before I fell asleep. As I woke up with a book in my hands I did some more reading until the evening. Then Yogi came at my place. He looked like he had been reading a lot – his eyes were red. He said he’d run out of books and asked me for some. Then we continued reading all night.”