Proposing after 30 minutes

At a country-club party a young man was introduced to an attractive girl.  Immediately he began paying her court
and flattering her outrageously. The girl liked the young man, but she was taken a bit aback by his fast and ardent
pitch. She was amazed when after 30 minutes he seriously
proposed marriage.

"Look," she said. "We only met a half hour ago. How can
you be so sure? We know nothing about each other."

"You're wrong," the young man declared. "For the past 5
years I've been working in the bank where your father
has his account.