A class professor was giving a lecture on company slogans and was asking his students if they were familiar with them.
"Joe," he asked, "which company has the slogan, `come fly the friendly skies`?"
Joe answered the correct airline.
"Brenda, can you tell me which company has the slogan, "Don`t leave home without it?"
Brenda answered the correct credit card company with no difficulty.
"Now John, Tell me which company bears the slogan, `Just do it`?"
and John answered, "Mom."