Found it,,,
It seems that this old couple were having trouble remembering things, so they
sign up for a memory course. The course is wonderful; they come home and tell
all their relatives, friends, and neighbors about it. Some months later, a
neighbor approaches the man as he tends the garden.
Neighbor asks, "Say, Ed, what was the name of the instructor of that memory
course you liked so much?"
Ed replies, "Well, it was...hmmm...let me think a minute... What's the name
of that flower, you know, the one that smells so nice, but has thorns on the
stems...?
Neighbor says, "You mean a rose?"
Ed replies, "Yeah, that's it...(shouting toward house) Hey, Rose, what was
the memory course instructor's name?