Archie and Edith...

Yaakov: Make sure you buy celery for me before tisha b'av.
Me: Okay.
Yaakov: Can you believe it? Twelve years.
Me: I thought it was thirteen?
Yaakov: No, we met tisha b'av in '95.
...pause...
Me: (changing subject) I must be a glutton for punishment.
Yaakov: ...?
Me: (laughing) No, I meant that I ate too many tacos tonight.