Last time in SFO:
(Wife & I have different last names, and she's a German citizen, I'm U.S.)
USA: Are you two married?
Me: yes
USA: How long were you out of the country.
Wife: Two weeks
Me: More like 2 and a half
Wife: 16 days isn't 2 and a half
Me: it was 17 days
Wife: No, we left on Saturday, and today's Monday
Me: We left on Friday!
USA: Stamps the passports, "Welcome home"