A police car pulled up in front of grandma's house, and grandpa got out.
The polite policeman explained that this elderly gentleman said that he was lost in the park and couldn't find his way home.
"Oh papa," said grandma, "You've been going to that park for over 30 years! So how could you get lost?"
Leaning close to grandma, so that the policeman couldn't hear, he whispered, "I wasn't lost mama... I was just too tired to walk home."