A while ago somebody reminded me this old Eastern-European joke. I cannot
give any source – this is folklore.

An old Jew and a young Jew are traveling on the train. The young
Jew asks: Excuse me, what time is it? The old Jew does not
answer. Excuse me, sir, what time is it? The old Jew keeps
silent. Sir, Im asking you what time is it. Why dont you
answer?! The old Jew says: Son, the next stop is the last on
this route. I dont know you, so you must be a stranger. If I
answer you now, Ill have to invite you to my home. Youre handsome,
and I have a beautiful daughter. You will both fall in love
and you will want to get married. Tell me, why would I need a
son-in-law who cant even afford a watch?