A kid called up his mother from his college and asked her for some money, because he ran out of it.

The mother replied, "Sure, sweetie. I'll send you some money. You also left your calculus book here when you visited 2 weeks ago. Do you want me to send that up too?"

"Uhh, oh yeah, OK," responded the kid.

So the mother wrapped the book along with the checks up in a package, kissed her husband goodbye, and went to the post office to mail the money and the book.

When she returned, her husband asked, "Well how much did you give the boy this time?

The mother said, "Oh, I wrote 2 checks, one for $20, and the other for $1000 out to him"

"That's $1020!" yelled the man, "Are you crazy?"

"Don't worry hon," she said, as she kissed him on the on top of his bald head, "I taped the $20 check to the cover of his book, but I put the $1000 one somewhere between the pages in chapter 19!"