I also like this one:

A man on his deathbed tells his priest, doctor, and lawyer that he's giving each of them $1 million and he wants them to put it in his coffin so he can really "take it with him." He dies shortly thereafter.

At the funeral, the priest tells the other two men "I have to confess something. The deceased had promised for years to donate money to the church to repair our steeple, but he kept putting it off. I knew he really wanted the steeple repaired, so I took $100,000, but I put the other $900,000 in the coffin, I swear!"

The doctor then says "I'm glad you said that. The deceased's illness actually could have been caught sooner and he might have lived, but our MRI machine is out-dated. He told me he hoped this never happened to anyone else, so I took $200,000 to get an updated MRI machine, so no one else has to go through the same thing. I know that's what he would have wanted. But I put the other $800,000 in the coffin, I swear!"

The lawyer then looks at the two of them and says "I am SHOCKED at the two of you! That man asked us to carry out his dying wish, and both of you took advantage of that. My personal check for $1 million was buried in that coffin!"