It reminded me of when I was younger, and I thought that marriage licenses had expiration dates, like driver's licenses do. When I was informed that marriage licenses never expire, I thought "What a great idea, though! Expiry dates on marriages! Then there wouldn't be all this trouble with divorce!" Then I thought, "And I'll be the guy who forgets to renew his license. And then I'll be in REALLY big trouble."
Me: Happy anniversary, honey! I got you some flowers, and this nicely wrapped gift that is NOT a kitchen appliance!
Wife: Can you believe it, dear? We've been married for five years already?
Me: Yeah, it's . . . wait. Did you say five years?
Me: (pause) I'll be right back.