Flowers?

When I go to a local discount store to get oil and filters for my car, I buy my wife a bouquet of flowers on display near the checkout counter.

During one trip, some women in line behind me were oohing and aahing about a husband getting flowers for his wife. "How often do you do that?" one asked.

Before I could answer, the cashier, more than familiar with my routine, said, "Every three months or 3,000 miles, whichever comes first."