Doctors orders

A doctor is walking down the street when he notices an 85-year-old patient coming
towards him with a very beautiful well-built young lady on his arm. The patient is looking
the happiest that the Doc had ever seen him.
When the old guy notices the doctor he walks up to him and says,
“Doc. I’ve taken your advice and look at me.”
Puzzled, the doc asks, “What was the advice I gave you?”
“You told me to get a hot Mama and be very cheerful!”
“Oh no.” says the Doc. “ I told you that you’d got a heart murmur and to be very careful!”