A guy is given instructions from his father for his first date. His father tells him, "If you find that you have run out of things to talk about, always remember the three Fs: 1)family, 2)food, and 3)philosophy

The guy goes and meets the girl and as soon as they see each other they run out of things to say. Remembering his father's wise advice, he employs the three Fs. "So do you have any brothers or sisters," he asks?

"Nope," she responds

The guy moves onto the next "F." "Well, do you like gefilte fish?"

"Nope," she responds again.

Getting exasperated the guy says "Well if you had brothers and sisters -- do you think they would have liked gefilte fish?"