Little Johnny and Mary were childhood sweethearts

Little Johnny and Mary were childhood sweethearts…..
Now an elderly couple,married and settled down in their old neighbourhood.
To celebrate their 50th wedding anniversary, they walk down to their old school.There they hold hands as they find the desk they shared and where Little Johnny had carved”I love you Mary”.
On their way home a bag of money falls out of an armoured car practically at their feet.Mary quickly picks it up .
The couple don’t know what to do with it so they take it home.There Mary counts the money and it totals fifty thousand dollars.
Little Johnny says”we’ve got to give it back”.
Mary says”Finders Keepers!”and puts the money back in the bag and hides it in the attic.
The next day two F.B.I men are going door to door in the neighbourhood looking for the money.One knocks on Little Johnny’s door and says”pardon me Sir but did either of you find any money that fell out of an armoured car yesterday?”.
Mary immediately says “no”
The elderly Johnny says”she’s lying “.
She hid it in the attic”.
Mary says”don’t believe him he’s SENILE”.
But the agents sit down with Little Johnny and begin to question him One says”tell us the story from the beginning “.
The old man says”well when Mary And I were walking home from school yesterday.. ”
At this the F.B.I guy looks at his partner and says “we’re outta here!”.